./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7 --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 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:53:47,320 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:53:47,322 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:53:47,371 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:53:47,372 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:53:47,378 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:53:47,380 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:53:47,384 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:53:47,387 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:53:47,395 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:53:47,396 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:53:47,399 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:53:47,399 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:53:47,402 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:53:47,404 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:53:47,410 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:53:47,412 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:53:47,414 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:53:47,416 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:53:47,427 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:53:47,430 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:53:47,431 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:53:47,435 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:53:47,436 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:53:47,440 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:53:47,440 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:53:47,441 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:53:47,443 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:53:47,444 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:53:47,445 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:53:47,446 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:53:47,448 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:53:47,450 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:53:47,451 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:53:47,453 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:53:47,453 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:53:47,454 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:53:47,454 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:53:47,455 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:53:47,456 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:53:47,457 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:53:47,457 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:53:47,504 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:53:47,504 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:53:47,505 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:53:47,505 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:53:47,516 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:53:47,517 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:53:47,517 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:53:47,517 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:53:47,517 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:53:47,518 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:53:47,519 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:53:47,519 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:53:47,519 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:53:47,520 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:53:47,520 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:53:47,520 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:53:47,520 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:53:47,520 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:53:47,521 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:53:47,522 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:53:47,522 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:53:47,522 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:53:47,522 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:53:47,522 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:53:47,523 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:53:47,523 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:53:47,525 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:53:47,525 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:53:47,525 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:53:47,525 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:53:47,526 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:53:47,526 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:53:47,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:53:47,527 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:53:47,527 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:53:47,527 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:53:47,527 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:53:47,528 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:53:47,528 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:53:47,528 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:53:47,528 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:53:47,528 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b [2021-11-25 18:53:47,825 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:53:47,847 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:53:47,849 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:53:47,851 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:53:47,852 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:53:47,853 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:47,926 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/1479c48d6/89f901e0078c497a9e4c3da469c62bee/FLAG6fa2bc042 [2021-11-25 18:53:48,521 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:53:48,521 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:48,544 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/1479c48d6/89f901e0078c497a9e4c3da469c62bee/FLAG6fa2bc042 [2021-11-25 18:53:48,825 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/1479c48d6/89f901e0078c497a9e4c3da469c62bee [2021-11-25 18:53:48,828 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:53:48,829 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:53:48,831 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:53:48,832 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:53:48,835 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:53:48,836 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:53:48" (1/1) ... [2021-11-25 18:53:48,838 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52d90f02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:48, skipping insertion in model container [2021-11-25 18:53:48,838 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:53:48" (1/1) ... [2021-11-25 18:53:48,845 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:53:48,884 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:53:49,102 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-25 18:53:49,108 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-25 18:53:49,144 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:53:49,152 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:53:49,168 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-25 18:53:49,170 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-25 18:53:49,202 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:53:49,227 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:53:49,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49 WrapperNode [2021-11-25 18:53:49,227 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:53:49,228 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:53:49,228 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:53:49,229 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:53:49,236 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,246 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,268 INFO L137 Inliner]: procedures = 27, calls = 19, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 74 [2021-11-25 18:53:49,268 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:53:49,269 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:53:49,269 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:53:49,269 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:53:49,278 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,279 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,282 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,289 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,308 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,310 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,313 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:53:49,314 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:53:49,314 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:53:49,314 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:53:49,320 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (1/1) ... [2021-11-25 18:53:49,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:53:49,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:49,354 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:53:49,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:53:49,395 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:53:49,395 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 18:53:49,396 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 18:53:49,396 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-25 18:53:49,396 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-25 18:53:49,396 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:53:49,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:53:49,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:53:49,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:53:49,397 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:53:49,508 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:53:49,509 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:53:49,867 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:53:49,916 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:53:49,917 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:53:49,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:53:49 BoogieIcfgContainer [2021-11-25 18:53:49,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:53:49,922 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:53:49,922 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:53:49,926 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:53:49,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:53:48" (1/3) ... [2021-11-25 18:53:49,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33ea8b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:53:49, skipping insertion in model container [2021-11-25 18:53:49,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:49" (2/3) ... [2021-11-25 18:53:49,928 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33ea8b66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:53:49, skipping insertion in model container [2021-11-25 18:53:49,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:53:49" (3/3) ... [2021-11-25 18:53:49,929 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:49,935 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:53:49,936 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 18:53:49,988 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:53:49,996 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 [2021-11-25 18:53:49,996 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 18:53:50,015 INFO L276 IsEmpty]: Start isEmpty. Operand has 49 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 37 states have internal predecessors, (52), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 18:53:50,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 18:53:50,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:50,021 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 18:53:50,021 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:50,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:50,027 INFO L85 PathProgramCache]: Analyzing trace with hash 6807338, now seen corresponding path program 1 times [2021-11-25 18:53:50,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:53:50,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062923867] [2021-11-25 18:53:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:50,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:53:50,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 18:53:50,154 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 18:53:50,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 18:53:50,206 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 18:53:50,208 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 18:53:50,210 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (1 of 2 remaining) [2021-11-25 18:53:50,212 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 2 remaining) [2021-11-25 18:53:50,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:53:50,218 INFO L732 BasicCegarLoop]: Path program histogram: [1] [2021-11-25 18:53:50,221 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 18:53:50,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 06:53:50 BoogieIcfgContainer [2021-11-25 18:53:50,247 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 18:53:50,250 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 18:53:50,251 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 18:53:50,251 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 18:53:50,252 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:53:49" (3/4) ... [2021-11-25 18:53:50,255 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-25 18:53:50,255 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 18:53:50,258 INFO L158 Benchmark]: Toolchain (without parser) took 1427.33ms. Allocated memory is still 123.7MB. Free memory was 88.7MB in the beginning and 63.0MB in the end (delta: 25.7MB). Peak memory consumption was 24.3MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,258 INFO L158 Benchmark]: CDTParser took 0.29ms. Allocated memory is still 90.2MB. Free memory was 60.3MB in the beginning and 60.3MB in the end (delta: 25.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 18:53:50,261 INFO L158 Benchmark]: CACSL2BoogieTranslator took 395.97ms. Allocated memory is still 123.7MB. Free memory was 88.5MB in the beginning and 96.0MB in the end (delta: -7.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,262 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.28ms. Allocated memory is still 123.7MB. Free memory was 96.0MB in the beginning and 93.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,268 INFO L158 Benchmark]: Boogie Preprocessor took 44.02ms. Allocated memory is still 123.7MB. Free memory was 93.9MB in the beginning and 92.4MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,271 INFO L158 Benchmark]: RCFGBuilder took 606.30ms. Allocated memory is still 123.7MB. Free memory was 92.4MB in the beginning and 77.1MB in the end (delta: 15.3MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,271 INFO L158 Benchmark]: TraceAbstraction took 325.44ms. Allocated memory is still 123.7MB. Free memory was 76.7MB in the beginning and 63.6MB in the end (delta: 13.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2021-11-25 18:53:50,272 INFO L158 Benchmark]: Witness Printer took 5.09ms. Allocated memory is still 123.7MB. Free memory was 63.6MB in the beginning and 63.0MB in the end (delta: 573.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 18:53:50,280 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29ms. Allocated memory is still 90.2MB. Free memory was 60.3MB in the beginning and 60.3MB in the end (delta: 25.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 395.97ms. Allocated memory is still 123.7MB. Free memory was 88.5MB in the beginning and 96.0MB in the end (delta: -7.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.28ms. Allocated memory is still 123.7MB. Free memory was 96.0MB in the beginning and 93.9MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 44.02ms. Allocated memory is still 123.7MB. Free memory was 93.9MB in the beginning and 92.4MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 606.30ms. Allocated memory is still 123.7MB. Free memory was 92.4MB in the beginning and 77.1MB in the end (delta: 15.3MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 325.44ms. Allocated memory is still 123.7MB. Free memory was 76.7MB in the beginning and 63.6MB in the end (delta: 13.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * Witness Printer took 5.09ms. Allocated memory is still 123.7MB. Free memory was 63.6MB in the beginning and 63.0MB in the end (delta: 573.9kB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 48]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 47, overapproximation of someBinaryArithmeticFLOAToperation at line 45. Possible FailurePath: [L310] COND TRUE __VERIFIER_nondet_int() [L311] CALL main1() [L39] float IN = __VERIFIER_nondet_float(); [L40] CALL assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L34] COND FALSE !(!cond) [L40] RET assume_abort_if_not(IN >= 0.0f && IN < 1.0f) [L42] float x = IN; [L44-L45] float result = 1.0f + 0.5f*x - 0.125f*x*x + 0.0625f*x*x*x - 0.0390625f*x*x*x*x; VAL [IN=49, x=49] [L47] COND TRUE !(result >= 0.0f && result < 1.5f) VAL [IN=49, x=49] [L48] reach_error() VAL [IN=49, x=49] - UnprovableResult [Line: 61]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 49 locations, 2 error locations. Started 1 CEGAR loops. OverallTime: 0.2s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: , PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 4 NumberOfCodeBlocks, 4 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-25 18:53:50,335 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7 --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 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:53:52,798 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:53:52,802 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:53:52,856 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:53:52,857 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:53:52,863 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:53:52,865 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:53:52,870 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:53:52,873 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:53:52,884 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:53:52,886 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:53:52,888 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:53:52,889 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:53:52,892 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:53:52,894 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:53:52,900 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:53:52,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:53:52,903 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:53:52,905 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:53:52,913 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:53:52,916 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:53:52,917 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:53:52,921 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:53:52,922 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:53:52,928 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:53:52,929 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:53:52,929 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:53:52,931 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:53:52,932 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:53:52,933 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:53:52,934 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:53:52,935 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:53:52,937 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:53:52,938 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:53:52,940 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:53:52,940 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:53:52,941 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:53:52,941 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:53:52,942 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:53:52,944 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:53:52,944 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:53:52,945 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-25 18:53:52,991 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:53:52,991 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:53:52,992 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:53:52,993 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:53:52,993 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:53:52,994 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:53:52,994 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:53:52,994 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:53:52,994 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:53:52,995 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:53:52,996 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:53:52,996 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:53:52,998 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:53:52,998 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:53:52,998 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:53:52,998 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:53:52,999 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:53:52,999 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:53:52,999 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:53:52,999 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 18:53:53,000 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 18:53:53,000 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 18:53:53,000 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:53:53,000 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:53:53,001 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:53:53,001 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:53:53,001 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:53:53,001 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 18:53:53,001 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:53:53,002 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:53:53,002 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:53:53,002 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:53:53,003 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:53:53,003 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 18:53:53,003 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 18:53:53,003 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:53:53,004 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:53:53,004 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:53:53,004 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e745a133311e60f1a9e202bf4fcb9b524a944d790f4c1df2987f4b8dfd5e08b [2021-11-25 18:53:53,373 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:53:53,398 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:53:53,401 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:53:53,402 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:53:53,403 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:53:53,405 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:53,488 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/e9741001d/14f7fb7fa91c49f6a8b95f0ac60c2b03/FLAG1f4585406 [2021-11-25 18:53:54,133 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:53:54,134 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:54,148 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/e9741001d/14f7fb7fa91c49f6a8b95f0ac60c2b03/FLAG1f4585406 [2021-11-25 18:53:54,440 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/data/e9741001d/14f7fb7fa91c49f6a8b95f0ac60c2b03 [2021-11-25 18:53:54,443 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:53:54,445 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:53:54,448 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:53:54,448 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:53:54,452 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:53:54,453 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:54,455 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65686e13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54, skipping insertion in model container [2021-11-25 18:53:54,455 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:54,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:53:54,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:53:54,713 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-25 18:53:54,719 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-25 18:53:54,765 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:53:54,798 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:53:54,831 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[1995,2008] [2021-11-25 18:53:54,833 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_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/sv-benchmarks/c/combinations/square_8+soft_float_4-2a.c.cil.c[2389,2402] [2021-11-25 18:53:54,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:53:54,898 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:53:54,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54 WrapperNode [2021-11-25 18:53:54,899 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:53:54,900 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:53:54,900 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:53:54,900 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:53:54,907 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:54,932 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:54,965 INFO L137 Inliner]: procedures = 28, calls = 19, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 70 [2021-11-25 18:53:54,966 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:53:54,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:53:54,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:53:54,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:53:54,976 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:54,977 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,001 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,001 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,009 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,013 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,028 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,033 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:53:55,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:53:55,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:53:55,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:53:55,035 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (1/1) ... [2021-11-25 18:53:55,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:53:55,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:53:55,089 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:53:55,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:53:55,140 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:53:55,140 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 18:53:55,140 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 18:53:55,140 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 18:53:55,141 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2021-11-25 18:53:55,141 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2021-11-25 18:53:55,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:53:55,141 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:53:55,141 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:53:55,141 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:53:55,258 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:53:55,261 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:53:57,774 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:53:57,783 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:53:57,783 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 18:53:57,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:53:57 BoogieIcfgContainer [2021-11-25 18:53:57,786 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:53:57,788 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:53:57,788 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:53:57,792 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:53:57,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:53:54" (1/3) ... [2021-11-25 18:53:57,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7434c75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:53:57, skipping insertion in model container [2021-11-25 18:53:57,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:53:54" (2/3) ... [2021-11-25 18:53:57,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7434c75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:53:57, skipping insertion in model container [2021-11-25 18:53:57,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:53:57" (3/3) ... [2021-11-25 18:53:57,796 INFO L111 eAbstractionObserver]: Analyzing ICFG square_8+soft_float_4-2a.c.cil.c [2021-11-25 18:53:57,801 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:53:57,802 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 18:53:57,855 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:53:57,863 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 [2021-11-25 18:53:57,863 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 18:53:57,883 INFO L276 IsEmpty]: Start isEmpty. Operand has 63 states, 49 states have (on average 1.489795918367347) internal successors, (73), 51 states have internal predecessors, (73), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 18:53:57,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:53:57,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:57,889 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:53:57,890 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:57,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:57,896 INFO L85 PathProgramCache]: Analyzing trace with hash -548115930, now seen corresponding path program 1 times [2021-11-25 18:53:57,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:53:57,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [433056372] [2021-11-25 18:53:57,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:57,911 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:53:57,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:53:57,915 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:53:57,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 18:53:58,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:53:58,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 18:53:58,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:53:58,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:53:58,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:53:58,682 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:53:58,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [433056372] [2021-11-25 18:53:58,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [433056372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:53:58,683 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:53:58,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:53:58,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104408252] [2021-11-25 18:53:58,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:53:58,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:53:58,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:53:58,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:53:58,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:53:58,723 INFO L87 Difference]: Start difference. First operand has 63 states, 49 states have (on average 1.489795918367347) internal successors, (73), 51 states have internal predecessors, (73), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-25 18:53:58,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:53:58,755 INFO L93 Difference]: Finished difference Result 121 states and 178 transitions. [2021-11-25 18:53:58,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:53:58,759 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 7 [2021-11-25 18:53:58,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:53:58,770 INFO L225 Difference]: With dead ends: 121 [2021-11-25 18:53:58,770 INFO L226 Difference]: Without dead ends: 56 [2021-11-25 18:53:58,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:53:58,778 INFO L933 BasicCegarLoop]: 81 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, 81 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 [2021-11-25 18:53:58,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:53:58,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-25 18:53:58,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-25 18:53:58,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 45 states have internal predecessors, (58), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:53:58,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-11-25 18:53:58,824 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 7 [2021-11-25 18:53:58,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:53:58,824 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-11-25 18:53:58,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-25 18:53:58,825 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-11-25 18:53:58,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:53:58,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:53:58,826 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:53:58,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:53:59,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:53:59,040 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:53:59,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:53:59,041 INFO L85 PathProgramCache]: Analyzing trace with hash -548056348, now seen corresponding path program 1 times [2021-11-25 18:53:59,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:53:59,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737321336] [2021-11-25 18:53:59,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:53:59,042 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:53:59,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:53:59,052 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:53:59,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 18:54:18,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:54:18,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:54:18,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:54:32,934 WARN L838 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse0 ((_ to_fp 8 24) c_currentRoundingMode 1.0))) (and (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse0) (= |c_ULTIMATE.start_main1_~result~0#1| (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode (fp.sub c_currentRoundingMode (fp.add c_currentRoundingMode .cse0 (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode (fp.mul c_currentRoundingMode ((_ to_fp 8 24) c_currentRoundingMode (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))))) (= c_currentRoundingMode roundNearestTiesToEven)) is different from false [2021-11-25 18:55:23,263 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))) (not (fp.geq .cse0 (_ +zero 8 24))))) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1)))) is different from false [2021-11-25 18:55:25,340 WARN L860 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~IN~0#1| (_ FloatingPoint 8 24))) (let ((.cse1 ((_ to_fp 8 24) roundNearestTiesToEven 1.0))) (and (let ((.cse0 (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven (fp.sub roundNearestTiesToEven (fp.add roundNearestTiesToEven .cse1 (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 2.0)) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 8.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 1.0 16.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)) (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven (fp.mul roundNearestTiesToEven ((_ to_fp 8 24) roundNearestTiesToEven (/ 5.0 128.0)) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|) |ULTIMATE.start_main1_~IN~0#1|)))) (or (not (fp.lt .cse0 ((_ to_fp 8 24) roundNearestTiesToEven (/ 3.0 2.0)))) (not (fp.geq .cse0 (_ +zero 8 24))))) (fp.geq |ULTIMATE.start_main1_~IN~0#1| (_ +zero 8 24)) (fp.lt |ULTIMATE.start_main1_~IN~0#1| .cse1)))) is different from true [2021-11-25 18:55:25,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:55:25,341 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:25,342 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:25,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737321336] [2021-11-25 18:55:25,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737321336] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:25,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:25,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:55:25,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624240031] [2021-11-25 18:55:25,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:25,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:55:25,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:25,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:55:25,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=12, Unknown=3, NotChecked=14, Total=42 [2021-11-25 18:55:25,348 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 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) [2021-11-25 18:55:27,877 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.30s for a HTC check with result UNKNOWN. Formula has sorts [Bool, FloatingPoint, RoundingMode, Real, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-25 18:55:28,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:28,179 INFO L93 Difference]: Finished difference Result 56 states and 73 transitions. [2021-11-25 18:55:28,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:55:28,180 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 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 7 [2021-11-25 18:55:28,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:28,182 INFO L225 Difference]: With dead ends: 56 [2021-11-25 18:55:28,182 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 18:55:28,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=18, Invalid=17, Unknown=3, NotChecked=18, Total=56 [2021-11-25 18:55:28,185 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 68 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:28,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 172 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 1 Unknown, 141 Unchecked, 2.6s Time] [2021-11-25 18:55:28,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 18:55:28,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-25 18:55:28,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 39 states have (on average 1.358974358974359) internal successors, (53), 40 states have internal predecessors, (53), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:55:28,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2021-11-25 18:55:28,197 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 7 [2021-11-25 18:55:28,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:28,198 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2021-11-25 18:55:28,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 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) [2021-11-25 18:55:28,198 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2021-11-25 18:55:28,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 18:55:28,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:28,200 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:28,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:28,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:28,416 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:28,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:28,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1078958274, now seen corresponding path program 1 times [2021-11-25 18:55:28,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:28,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [806045466] [2021-11-25 18:55:28,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:28,418 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:28,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:28,427 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:28,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 18:55:28,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:28,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:55:28,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:28,881 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:28,882 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:28,882 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:28,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [806045466] [2021-11-25 18:55:28,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [806045466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:28,883 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:28,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:55:28,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993384237] [2021-11-25 18:55:28,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:28,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:55:28,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:28,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:55:28,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:55:28,886 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:29,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:29,241 INFO L93 Difference]: Finished difference Result 100 states and 135 transitions. [2021-11-25 18:55:29,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:55:29,242 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2021-11-25 18:55:29,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:29,246 INFO L225 Difference]: With dead ends: 100 [2021-11-25 18:55:29,246 INFO L226 Difference]: Without dead ends: 72 [2021-11-25 18:55:29,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:55:29,249 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 20 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:29,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 438 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:55:29,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-25 18:55:29,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2021-11-25 18:55:29,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.297872340425532) internal successors, (61), 49 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-25 18:55:29,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-11-25 18:55:29,267 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 32 [2021-11-25 18:55:29,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:29,268 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-11-25 18:55:29,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:29,269 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-11-25 18:55:29,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:55:29,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:29,271 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 18:55:29,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:29,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:29,489 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:29,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:29,491 INFO L85 PathProgramCache]: Analyzing trace with hash 452521591, now seen corresponding path program 1 times [2021-11-25 18:55:29,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:29,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [494126088] [2021-11-25 18:55:29,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:29,492 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:29,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:29,494 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:29,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 18:55:29,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:29,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:55:29,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:30,037 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:30,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:30,341 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:30,341 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:30,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [494126088] [2021-11-25 18:55:30,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [494126088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:30,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [409064517] [2021-11-25 18:55:30,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:30,343 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:30,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:55:30,349 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:55:30,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-25 18:55:30,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:30,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:55:30,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:30,653 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:30,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:30,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [409064517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:30,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378087740] [2021-11-25 18:55:30,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:30,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:30,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:30,965 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:30,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:55:31,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:31,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:55:31,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:31,204 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:31,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:31,475 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:31,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378087740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:31,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:55:31,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 9 [2021-11-25 18:55:31,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13894078] [2021-11-25 18:55:31,476 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:31,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:55:31,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:31,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:55:31,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:55:31,479 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 18:55:31,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:31,979 INFO L93 Difference]: Finished difference Result 122 states and 160 transitions. [2021-11-25 18:55:31,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:55:31,982 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2021-11-25 18:55:31,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:31,985 INFO L225 Difference]: With dead ends: 122 [2021-11-25 18:55:31,985 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 18:55:31,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:55:31,988 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 26 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:31,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 508 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:55:31,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 18:55:32,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 72. [2021-11-25 18:55:32,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 54 states have (on average 1.2777777777777777) internal successors, (69), 56 states have internal predecessors, (69), 11 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (14), 10 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-25 18:55:32,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 94 transitions. [2021-11-25 18:55:32,005 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 94 transitions. Word has length 36 [2021-11-25 18:55:32,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:32,006 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 94 transitions. [2021-11-25 18:55:32,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 18:55:32,006 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 94 transitions. [2021-11-25 18:55:32,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:55:32,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:32,009 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:32,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:32,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:32,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:32,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:32,624 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:32,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:32,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1328087799, now seen corresponding path program 1 times [2021-11-25 18:55:32,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:32,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [154226542] [2021-11-25 18:55:32,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:32,625 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:32,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:32,627 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:32,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 18:55:32,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:32,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:55:32,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:33,066 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:33,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:33,374 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:33,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:33,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [154226542] [2021-11-25 18:55:33,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [154226542] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:33,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1035678417] [2021-11-25 18:55:33,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:33,375 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:33,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:55:33,376 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:55:33,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-25 18:55:33,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:33,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:55:33,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:33,902 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 18:55:33,902 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:33,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1035678417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:33,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:55:33,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8] total 12 [2021-11-25 18:55:33,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594256640] [2021-11-25 18:55:33,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:33,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:55:33,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:33,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:55:33,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:55:33,906 INFO L87 Difference]: Start difference. First operand 72 states and 94 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:55:34,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:34,459 INFO L93 Difference]: Finished difference Result 115 states and 149 transitions. [2021-11-25 18:55:34,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:55:34,465 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2021-11-25 18:55:34,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:34,468 INFO L225 Difference]: With dead ends: 115 [2021-11-25 18:55:34,468 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 18:55:34,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:55:34,470 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 19 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 531 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:34,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 531 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:55:34,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 18:55:34,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2021-11-25 18:55:34,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 62 states have internal predecessors, (76), 12 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-25 18:55:34,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 103 transitions. [2021-11-25 18:55:34,493 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 103 transitions. Word has length 40 [2021-11-25 18:55:34,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:34,494 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 103 transitions. [2021-11-25 18:55:34,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:55:34,494 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 103 transitions. [2021-11-25 18:55:34,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:55:34,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:34,497 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:34,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:34,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:34,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:34,903 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:34,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:34,904 INFO L85 PathProgramCache]: Analyzing trace with hash 78255138, now seen corresponding path program 2 times [2021-11-25 18:55:34,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:34,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [547670704] [2021-11-25 18:55:34,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:55:34,905 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:34,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:34,911 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:34,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-25 18:55:34,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-25 18:55:34,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:55:34,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:55:34,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:35,435 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 18:55:35,436 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:35,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:35,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [547670704] [2021-11-25 18:55:35,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [547670704] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:35,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:35,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:55:35,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153323038] [2021-11-25 18:55:35,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:35,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:55:35,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:35,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:55:35,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:55:35,438 INFO L87 Difference]: Start difference. First operand 80 states and 103 transitions. Second operand has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:35,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:35,697 INFO L93 Difference]: Finished difference Result 99 states and 124 transitions. [2021-11-25 18:55:35,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:55:35,701 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-11-25 18:55:35,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:35,703 INFO L225 Difference]: With dead ends: 99 [2021-11-25 18:55:35,703 INFO L226 Difference]: Without dead ends: 97 [2021-11-25 18:55:35,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:55:35,705 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 9 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:35,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 334 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 10 Unchecked, 0.1s Time] [2021-11-25 18:55:35,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-25 18:55:35,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 86. [2021-11-25 18:55:35,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.265625) internal successors, (81), 67 states have internal predecessors, (81), 13 states have call successors, (13), 7 states have call predecessors, (13), 8 states have return successors, (16), 11 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 18:55:35,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 110 transitions. [2021-11-25 18:55:35,720 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 110 transitions. Word has length 40 [2021-11-25 18:55:35,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:35,721 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 110 transitions. [2021-11-25 18:55:35,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:35,721 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 110 transitions. [2021-11-25 18:55:35,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:55:35,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:35,724 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:35,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:35,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:35,942 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:35,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:35,942 INFO L85 PathProgramCache]: Analyzing trace with hash 135513440, now seen corresponding path program 1 times [2021-11-25 18:55:35,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:35,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [827838670] [2021-11-25 18:55:35,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:35,942 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:35,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:35,943 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:35,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-25 18:55:35,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:35,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:55:35,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:36,443 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 18:55:36,443 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:36,443 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:36,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [827838670] [2021-11-25 18:55:36,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [827838670] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:36,444 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:36,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:55:36,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181125324] [2021-11-25 18:55:36,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:36,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:55:36,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:36,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:55:36,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:55:36,446 INFO L87 Difference]: Start difference. First operand 86 states and 110 transitions. Second operand has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:36,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:36,698 INFO L93 Difference]: Finished difference Result 95 states and 119 transitions. [2021-11-25 18:55:36,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:55:36,699 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-11-25 18:55:36,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:36,700 INFO L225 Difference]: With dead ends: 95 [2021-11-25 18:55:36,701 INFO L226 Difference]: Without dead ends: 93 [2021-11-25 18:55:36,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:55:36,702 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 9 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:36,703 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 312 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-25 18:55:36,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-25 18:55:36,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 84. [2021-11-25 18:55:36,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 63 states have (on average 1.253968253968254) internal successors, (79), 65 states have internal predecessors, (79), 12 states have call successors, (12), 7 states have call predecessors, (12), 8 states have return successors, (15), 11 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-25 18:55:36,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 106 transitions. [2021-11-25 18:55:36,721 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 106 transitions. Word has length 40 [2021-11-25 18:55:36,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:36,721 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 106 transitions. [2021-11-25 18:55:36,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:55:36,722 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 106 transitions. [2021-11-25 18:55:36,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 18:55:36,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:36,736 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1] [2021-11-25 18:55:36,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:36,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:36,949 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:36,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:36,949 INFO L85 PathProgramCache]: Analyzing trace with hash 463941786, now seen corresponding path program 1 times [2021-11-25 18:55:36,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:36,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [213080099] [2021-11-25 18:55:36,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:36,950 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:36,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:36,951 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:36,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 18:55:37,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:37,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:55:37,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:37,476 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:37,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:38,018 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:38,018 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:38,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [213080099] [2021-11-25 18:55:38,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [213080099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:38,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [377889611] [2021-11-25 18:55:38,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:38,019 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:38,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:55:38,024 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:55:38,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-25 18:55:38,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:38,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:55:38,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:38,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:38,776 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:38,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [377889611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:38,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356598055] [2021-11-25 18:55:38,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:38,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:38,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:38,780 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:38,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:55:38,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:38,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:55:38,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:39,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:39,496 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:39,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356598055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:39,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:55:39,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-25 18:55:39,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838571444] [2021-11-25 18:55:39,497 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:39,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:55:39,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:39,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:55:39,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:55:39,499 INFO L87 Difference]: Start difference. First operand 84 states and 106 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:55:40,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:40,146 INFO L93 Difference]: Finished difference Result 130 states and 169 transitions. [2021-11-25 18:55:40,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:55:40,147 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 45 [2021-11-25 18:55:40,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:40,149 INFO L225 Difference]: With dead ends: 130 [2021-11-25 18:55:40,149 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 18:55:40,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:55:40,153 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 48 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:40,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 503 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:55:40,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 18:55:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 98. [2021-11-25 18:55:40,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 76 states have internal predecessors, (89), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 14 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:55:40,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 125 transitions. [2021-11-25 18:55:40,172 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 125 transitions. Word has length 45 [2021-11-25 18:55:40,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:40,173 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 125 transitions. [2021-11-25 18:55:40,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:55:40,173 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 125 transitions. [2021-11-25 18:55:40,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 18:55:40,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:40,175 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:40,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:40,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:40,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:40,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:40,793 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:40,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:40,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1165006364, now seen corresponding path program 1 times [2021-11-25 18:55:40,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:40,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [89395456] [2021-11-25 18:55:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:40,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:40,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:40,795 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:40,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 18:55:40,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:40,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:55:40,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:41,398 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:41,398 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:41,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:41,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [89395456] [2021-11-25 18:55:41,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [89395456] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:41,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:41,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 18:55:41,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152153959] [2021-11-25 18:55:41,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:41,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:55:41,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:41,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:55:41,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:55:41,400 INFO L87 Difference]: Start difference. First operand 98 states and 125 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:55:42,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:42,487 INFO L93 Difference]: Finished difference Result 134 states and 171 transitions. [2021-11-25 18:55:42,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:55:42,488 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 45 [2021-11-25 18:55:42,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:42,490 INFO L225 Difference]: With dead ends: 134 [2021-11-25 18:55:42,490 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 18:55:42,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:55:42,492 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 34 mSDsluCounter, 605 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:42,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 676 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 18:55:42,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 18:55:42,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 100. [2021-11-25 18:55:42,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 74 states have (on average 1.2297297297297298) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 7 states have call predecessors, (15), 10 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:55:42,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 127 transitions. [2021-11-25 18:55:42,511 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 127 transitions. Word has length 45 [2021-11-25 18:55:42,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:42,512 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 127 transitions. [2021-11-25 18:55:42,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:55:42,512 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 127 transitions. [2021-11-25 18:55:42,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 18:55:42,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:42,514 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:42,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:42,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:42,728 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:42,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:42,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1862719454, now seen corresponding path program 1 times [2021-11-25 18:55:42,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:42,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1512268900] [2021-11-25 18:55:42,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:42,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:42,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:42,730 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:42,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-25 18:55:42,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:42,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:55:42,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:43,390 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:43,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:44,161 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:44,161 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:44,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1512268900] [2021-11-25 18:55:44,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1512268900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:44,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1639954681] [2021-11-25 18:55:44,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:44,162 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:44,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:55:44,163 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:55:44,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-25 18:55:44,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:44,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:55:44,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:44,831 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:44,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:45,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1639954681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:45,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169311678] [2021-11-25 18:55:45,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:45,796 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:45,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:45,797 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:45,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 18:55:45,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:45,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:55:45,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:46,079 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:46,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:46,638 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:55:46,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169311678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:46,639 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:55:46,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10, 10, 11, 11] total 21 [2021-11-25 18:55:46,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307280997] [2021-11-25 18:55:46,640 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:46,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 18:55:46,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:46,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 18:55:46,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=372, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:55:46,642 INFO L87 Difference]: Start difference. First operand 100 states and 127 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 18:55:49,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:49,576 INFO L93 Difference]: Finished difference Result 178 states and 230 transitions. [2021-11-25 18:55:49,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:55:49,577 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) Word has length 47 [2021-11-25 18:55:49,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:49,579 INFO L225 Difference]: With dead ends: 178 [2021-11-25 18:55:49,579 INFO L226 Difference]: Without dead ends: 149 [2021-11-25 18:55:49,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:55:49,582 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 106 mSDsluCounter, 1114 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 1188 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:49,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 1188 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 18:55:49,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-25 18:55:49,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 124. [2021-11-25 18:55:49,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 93 states have (on average 1.2043010752688172) internal successors, (112), 95 states have internal predecessors, (112), 18 states have call successors, (18), 9 states have call predecessors, (18), 12 states have return successors, (29), 19 states have call predecessors, (29), 17 states have call successors, (29) [2021-11-25 18:55:49,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 159 transitions. [2021-11-25 18:55:49,601 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 159 transitions. Word has length 47 [2021-11-25 18:55:49,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:49,602 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 159 transitions. [2021-11-25 18:55:49,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 17 states have internal predecessors, (48), 6 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (12), 7 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 18:55:49,602 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 159 transitions. [2021-11-25 18:55:49,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 18:55:49,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:49,604 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:49,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:49,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:50,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-25 18:55:50,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:50,225 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:50,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:50,226 INFO L85 PathProgramCache]: Analyzing trace with hash -1805461152, now seen corresponding path program 1 times [2021-11-25 18:55:50,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:50,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1619406966] [2021-11-25 18:55:50,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:50,226 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:50,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:50,227 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:50,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-25 18:55:50,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:50,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:55:50,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:50,465 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:55:50,465 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:55:50,465 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:50,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1619406966] [2021-11-25 18:55:50,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1619406966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:55:50,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:55:50,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:55:50,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015958473] [2021-11-25 18:55:50,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:55:50,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:55:50,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:50,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:55:50,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:55:50,468 INFO L87 Difference]: Start difference. First operand 124 states and 159 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:55:50,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:50,633 INFO L93 Difference]: Finished difference Result 132 states and 166 transitions. [2021-11-25 18:55:50,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:55:50,633 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 47 [2021-11-25 18:55:50,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:50,635 INFO L225 Difference]: With dead ends: 132 [2021-11-25 18:55:50,635 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 18:55:50,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:55:50,636 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 6 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:50,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 317 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:55:50,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 18:55:50,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-25 18:55:50,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 83 states have (on average 1.1927710843373494) internal successors, (99), 86 states have internal predecessors, (99), 16 states have call successors, (16), 8 states have call predecessors, (16), 11 states have return successors, (25), 16 states have call predecessors, (25), 15 states have call successors, (25) [2021-11-25 18:55:50,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 140 transitions. [2021-11-25 18:55:50,660 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 140 transitions. Word has length 47 [2021-11-25 18:55:50,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:50,661 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 140 transitions. [2021-11-25 18:55:50,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:55:50,661 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 140 transitions. [2021-11-25 18:55:50,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:55:50,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:50,663 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:50,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:50,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:55:50,872 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:50,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:50,872 INFO L85 PathProgramCache]: Analyzing trace with hash 2144611077, now seen corresponding path program 1 times [2021-11-25 18:55:50,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:50,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [607410791] [2021-11-25 18:55:50,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:50,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:50,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:50,874 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:50,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-25 18:55:50,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:50,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:55:50,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:51,680 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:51,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:53,432 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:55:53,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [607410791] [2021-11-25 18:55:53,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [607410791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:53,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1390537372] [2021-11-25 18:55:53,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:53,433 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:53,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:55:53,434 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:55:53,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-25 18:55:53,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:53,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:55:53,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:53,689 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:53,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:54,180 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:54,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1390537372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:54,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944079221] [2021-11-25 18:55:54,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:55:54,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:55:54,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:55:54,182 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:55:54,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 18:55:54,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:55:54,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:55:54,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:55:54,414 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:54,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:55:54,973 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:55:54,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944079221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:55:54,973 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:55:54,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-25 18:55:54,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652902162] [2021-11-25 18:55:54,974 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:55:54,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 18:55:54,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:55:54,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 18:55:54,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:55:54,975 INFO L87 Difference]: Start difference. First operand 111 states and 140 transitions. Second operand has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 18:55:59,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:55:59,320 INFO L93 Difference]: Finished difference Result 157 states and 214 transitions. [2021-11-25 18:55:59,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 18:55:59,321 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 49 [2021-11-25 18:55:59,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:55:59,324 INFO L225 Difference]: With dead ends: 157 [2021-11-25 18:55:59,324 INFO L226 Difference]: Without dead ends: 123 [2021-11-25 18:55:59,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=199, Invalid=1361, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:55:59,326 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 139 mSDsluCounter, 1152 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 1224 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:55:59,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 1224 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-25 18:55:59,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-25 18:55:59,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 100. [2021-11-25 18:55:59,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 74 states have (on average 1.2027027027027026) internal successors, (89), 79 states have internal predecessors, (89), 14 states have call successors, (14), 6 states have call predecessors, (14), 11 states have return successors, (32), 14 states have call predecessors, (32), 13 states have call successors, (32) [2021-11-25 18:55:59,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 135 transitions. [2021-11-25 18:55:59,344 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 135 transitions. Word has length 49 [2021-11-25 18:55:59,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:55:59,344 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 135 transitions. [2021-11-25 18:55:59,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 18:55:59,345 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 135 transitions. [2021-11-25 18:55:59,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:55:59,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:55:59,347 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:55:59,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:59,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:59,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-25 18:55:59,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:55:59,960 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:55:59,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:55:59,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1400781647, now seen corresponding path program 2 times [2021-11-25 18:55:59,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:55:59,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [146949305] [2021-11-25 18:55:59,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:55:59,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:55:59,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:55:59,963 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:55:59,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-25 18:56:00,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:00,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:00,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:56:00,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:00,808 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:00,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:02,510 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:02,510 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:02,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [146949305] [2021-11-25 18:56:02,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [146949305] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:02,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1863649092] [2021-11-25 18:56:02,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:02,511 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:02,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:02,512 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:02,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-25 18:56:02,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:02,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:02,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:56:02,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:02,772 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:02,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:03,277 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:03,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1863649092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:03,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286275043] [2021-11-25 18:56:03,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:03,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:03,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:03,284 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:03,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 18:56:03,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:03,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:03,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:56:03,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:03,559 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:03,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:04,104 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:56:04,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286275043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:04,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:56:04,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 24 [2021-11-25 18:56:04,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119000580] [2021-11-25 18:56:04,106 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:04,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 18:56:04,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:04,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 18:56:04,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:56:04,108 INFO L87 Difference]: Start difference. First operand 100 states and 135 transitions. Second operand has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 18:56:08,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:08,117 INFO L93 Difference]: Finished difference Result 138 states and 187 transitions. [2021-11-25 18:56:08,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:56:08,118 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 49 [2021-11-25 18:56:08,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:08,120 INFO L225 Difference]: With dead ends: 138 [2021-11-25 18:56:08,120 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 18:56:08,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 266 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=184, Invalid=1298, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 18:56:08,122 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 140 mSDsluCounter, 962 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:08,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 1036 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-25 18:56:08,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 18:56:08,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 84. [2021-11-25 18:56:08,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 67 states have internal predecessors, (77), 12 states have call successors, (12), 4 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-25 18:56:08,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 117 transitions. [2021-11-25 18:56:08,138 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 117 transitions. Word has length 49 [2021-11-25 18:56:08,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:08,138 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 117 transitions. [2021-11-25 18:56:08,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.0) internal successors, (44), 20 states have internal predecessors, (44), 4 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 18:56:08,139 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 117 transitions. [2021-11-25 18:56:08,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:56:08,140 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:08,140 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:08,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:08,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-25 18:56:08,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:08,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:08,763 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:08,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:08,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1227181886, now seen corresponding path program 1 times [2021-11-25 18:56:08,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:08,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [153993520] [2021-11-25 18:56:08,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:08,764 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:08,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:08,765 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:08,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-25 18:56:08,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:08,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:08,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:12,054 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 18:56:12,054 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:56:12,054 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:12,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [153993520] [2021-11-25 18:56:12,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [153993520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:56:12,054 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:56:12,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:56:12,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528960876] [2021-11-25 18:56:12,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:56:12,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:56:12,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:12,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:56:12,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:56:12,056 INFO L87 Difference]: Start difference. First operand 84 states and 117 transitions. Second operand has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:56:12,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:12,145 INFO L93 Difference]: Finished difference Result 91 states and 124 transitions. [2021-11-25 18:56:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:56:12,146 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 50 [2021-11-25 18:56:12,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:12,147 INFO L225 Difference]: With dead ends: 91 [2021-11-25 18:56:12,148 INFO L226 Difference]: Without dead ends: 89 [2021-11-25 18:56:12,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:56:12,149 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 7 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:12,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 348 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 28 Unchecked, 0.0s Time] [2021-11-25 18:56:12,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-25 18:56:12,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-25 18:56:12,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 71 states have internal predecessors, (80), 13 states have call successors, (13), 5 states have call predecessors, (13), 10 states have return successors, (29), 12 states have call predecessors, (29), 12 states have call successors, (29) [2021-11-25 18:56:12,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 122 transitions. [2021-11-25 18:56:12,162 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 122 transitions. Word has length 50 [2021-11-25 18:56:12,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:12,163 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 122 transitions. [2021-11-25 18:56:12,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:56:12,163 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 122 transitions. [2021-11-25 18:56:12,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 18:56:12,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:12,165 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:12,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:12,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:56:12,380 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:12,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:12,381 INFO L85 PathProgramCache]: Analyzing trace with hash 381005423, now seen corresponding path program 1 times [2021-11-25 18:56:12,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:12,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1061239810] [2021-11-25 18:56:12,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:12,382 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:12,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:12,383 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:12,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-25 18:56:12,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:12,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:12,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:16,554 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 18:56:16,555 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:56:16,555 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:16,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1061239810] [2021-11-25 18:56:16,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1061239810] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:56:16,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:56:16,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:56:16,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882975472] [2021-11-25 18:56:16,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:56:16,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:56:16,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:16,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:56:16,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2021-11-25 18:56:16,557 INFO L87 Difference]: Start difference. First operand 89 states and 122 transitions. Second operand has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:56:16,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:16,649 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2021-11-25 18:56:16,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:56:16,649 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-11-25 18:56:16,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:16,650 INFO L225 Difference]: With dead ends: 95 [2021-11-25 18:56:16,650 INFO L226 Difference]: Without dead ends: 91 [2021-11-25 18:56:16,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2021-11-25 18:56:16,652 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 14 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:16,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 313 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-25 18:56:16,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-25 18:56:16,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2021-11-25 18:56:16,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 64 states have (on average 1.21875) internal successors, (78), 68 states have internal predecessors, (78), 12 states have call successors, (12), 5 states have call predecessors, (12), 9 states have return successors, (28), 12 states have call predecessors, (28), 11 states have call successors, (28) [2021-11-25 18:56:16,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-25 18:56:16,668 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 51 [2021-11-25 18:56:16,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:16,669 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-25 18:56:16,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.285714285714286) internal successors, (30), 7 states have internal predecessors, (30), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 18:56:16,669 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-25 18:56:16,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 18:56:16,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:16,671 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:16,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:16,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:56:16,880 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:16,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:16,880 INFO L85 PathProgramCache]: Analyzing trace with hash 57968830, now seen corresponding path program 1 times [2021-11-25 18:56:16,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:16,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368822083] [2021-11-25 18:56:16,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:16,881 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:16,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:16,882 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:16,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-25 18:56:16,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:16,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:16,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:17,291 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:17,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:17,897 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:17,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368822083] [2021-11-25 18:56:17,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368822083] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:17,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1539051697] [2021-11-25 18:56:17,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:17,897 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:17,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:17,898 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:17,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-25 18:56:17,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:17,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:56:17,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:18,405 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:56:18,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:56:18,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1539051697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:56:18,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:56:18,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8, 8] total 14 [2021-11-25 18:56:18,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536035122] [2021-11-25 18:56:18,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:56:18,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:56:18,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:18,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:56:18,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:56:18,408 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:56:18,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:18,630 INFO L93 Difference]: Finished difference Result 118 states and 176 transitions. [2021-11-25 18:56:18,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:56:18,631 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 55 [2021-11-25 18:56:18,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:18,632 INFO L225 Difference]: With dead ends: 118 [2021-11-25 18:56:18,633 INFO L226 Difference]: Without dead ends: 107 [2021-11-25 18:56:18,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:56:18,634 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 31 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:18,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 286 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:56:18,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-25 18:56:18,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 100. [2021-11-25 18:56:18,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 79 states have internal predecessors, (89), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (44), 15 states have call predecessors, (44), 14 states have call successors, (44) [2021-11-25 18:56:18,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 148 transitions. [2021-11-25 18:56:18,650 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 148 transitions. Word has length 55 [2021-11-25 18:56:18,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:18,651 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 148 transitions. [2021-11-25 18:56:18,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 18:56:18,651 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 148 transitions. [2021-11-25 18:56:18,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 18:56:18,653 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:18,653 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:18,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:18,868 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-25 18:56:19,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:19,068 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:19,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:19,068 INFO L85 PathProgramCache]: Analyzing trace with hash -571789227, now seen corresponding path program 1 times [2021-11-25 18:56:19,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:19,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [555673387] [2021-11-25 18:56:19,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:19,069 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:19,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:19,071 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:19,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-25 18:56:19,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:19,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:19,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:19,615 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:19,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:20,325 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:20,326 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:20,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [555673387] [2021-11-25 18:56:20,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [555673387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:20,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [416250509] [2021-11-25 18:56:20,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:20,326 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:20,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:20,327 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:20,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-25 18:56:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:20,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:20,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:20,635 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:20,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:21,188 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:21,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [416250509] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:21,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236001093] [2021-11-25 18:56:21,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:21,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:21,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:21,190 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:21,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 18:56:21,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:21,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:21,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:21,520 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:21,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:22,168 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:22,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236001093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:22,169 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:56:22,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 18:56:22,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213553472] [2021-11-25 18:56:22,169 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:22,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:56:22,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:22,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:56:22,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:56:22,171 INFO L87 Difference]: Start difference. First operand 100 states and 148 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:22,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:22,961 INFO L93 Difference]: Finished difference Result 114 states and 166 transitions. [2021-11-25 18:56:22,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:56:22,962 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 64 [2021-11-25 18:56:22,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:22,963 INFO L225 Difference]: With dead ends: 114 [2021-11-25 18:56:22,964 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 18:56:22,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:56:22,965 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 112 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:22,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 443 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:56:22,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 18:56:22,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-25 18:56:22,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 82 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (46), 15 states have call predecessors, (46), 14 states have call successors, (46) [2021-11-25 18:56:22,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 152 transitions. [2021-11-25 18:56:22,980 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 152 transitions. Word has length 64 [2021-11-25 18:56:22,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:22,981 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 152 transitions. [2021-11-25 18:56:22,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:22,981 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 152 transitions. [2021-11-25 18:56:22,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 18:56:22,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:22,984 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:22,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:23,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-25 18:56:23,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-25 18:56:23,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:23,586 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:23,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:23,586 INFO L85 PathProgramCache]: Analyzing trace with hash -768011691, now seen corresponding path program 2 times [2021-11-25 18:56:23,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:23,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [112481815] [2021-11-25 18:56:23,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:23,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:23,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:23,588 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:23,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-25 18:56:23,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:23,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:23,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:23,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:24,036 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:24,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:24,719 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:24,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:24,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [112481815] [2021-11-25 18:56:24,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [112481815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:24,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [224312780] [2021-11-25 18:56:24,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:24,721 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:24,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:24,733 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:24,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-25 18:56:24,822 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:24,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:24,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:56:24,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:25,042 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:25,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:25,528 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:25,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [224312780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:25,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440623819] [2021-11-25 18:56:25,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:25,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:25,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:25,529 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:25,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 18:56:25,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:25,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:25,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:25,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:25,813 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:25,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:26,305 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:26,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440623819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:26,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:56:26,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 18:56:26,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58821855] [2021-11-25 18:56:26,307 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:26,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:56:26,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:26,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:56:26,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:56:26,309 INFO L87 Difference]: Start difference. First operand 103 states and 152 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:26,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:26,986 INFO L93 Difference]: Finished difference Result 116 states and 170 transitions. [2021-11-25 18:56:26,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:56:26,987 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 64 [2021-11-25 18:56:26,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:26,991 INFO L225 Difference]: With dead ends: 116 [2021-11-25 18:56:26,992 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 18:56:26,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:56:26,994 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 124 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:26,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 409 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:56:26,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 18:56:27,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-25 18:56:27,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 75 states have (on average 1.2133333333333334) internal successors, (91), 82 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 12 states have return successors, (45), 15 states have call predecessors, (45), 14 states have call successors, (45) [2021-11-25 18:56:27,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 151 transitions. [2021-11-25 18:56:27,010 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 151 transitions. Word has length 64 [2021-11-25 18:56:27,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:27,010 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 151 transitions. [2021-11-25 18:56:27,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 11 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:27,011 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 151 transitions. [2021-11-25 18:56:27,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:56:27,013 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:27,013 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:27,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-25 18:56:27,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-25 18:56:27,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:27,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:27,628 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:27,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:27,629 INFO L85 PathProgramCache]: Analyzing trace with hash 336770129, now seen corresponding path program 1 times [2021-11-25 18:56:27,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:27,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [634754468] [2021-11-25 18:56:27,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:27,630 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:27,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:27,630 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:27,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-25 18:56:27,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:27,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:27,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:28,084 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:28,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:28,803 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:28,803 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:28,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [634754468] [2021-11-25 18:56:28,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [634754468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:28,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [215813761] [2021-11-25 18:56:28,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:28,805 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:28,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:28,806 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:28,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-25 18:56:28,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:28,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:28,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:29,096 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:29,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:29,641 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:29,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [215813761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:29,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2111927006] [2021-11-25 18:56:29,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:29,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:29,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:29,643 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:29,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 18:56:29,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:29,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:29,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:29,955 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:29,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:30,451 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:30,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2111927006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:30,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:56:30,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 18:56:30,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938536855] [2021-11-25 18:56:30,452 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:30,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:56:30,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:30,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:56:30,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:56:30,454 INFO L87 Difference]: Start difference. First operand 103 states and 151 transitions. Second operand has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:31,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:31,216 INFO L93 Difference]: Finished difference Result 114 states and 162 transitions. [2021-11-25 18:56:31,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:56:31,217 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 66 [2021-11-25 18:56:31,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:31,218 INFO L225 Difference]: With dead ends: 114 [2021-11-25 18:56:31,219 INFO L226 Difference]: Without dead ends: 100 [2021-11-25 18:56:31,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-25 18:56:31,220 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 102 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:31,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 501 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:56:31,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-25 18:56:31,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-11-25 18:56:31,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.2054794520547945) internal successors, (88), 79 states have internal predecessors, (88), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (41), 15 states have call predecessors, (41), 14 states have call successors, (41) [2021-11-25 18:56:31,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 144 transitions. [2021-11-25 18:56:31,237 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 144 transitions. Word has length 66 [2021-11-25 18:56:31,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:31,237 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 144 transitions. [2021-11-25 18:56:31,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:31,238 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 144 transitions. [2021-11-25 18:56:31,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:56:31,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:31,241 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:31,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:31,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:31,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-25 18:56:31,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:31,856 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:31,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:31,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1198335757, now seen corresponding path program 2 times [2021-11-25 18:56:31,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:31,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1416920338] [2021-11-25 18:56:31,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:31,858 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:31,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:31,859 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:31,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-25 18:56:31,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:31,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:31,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:31,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:32,348 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:32,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:33,035 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:33,035 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:33,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1416920338] [2021-11-25 18:56:33,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1416920338] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:33,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [481847104] [2021-11-25 18:56:33,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:33,036 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:33,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:33,053 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:33,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-25 18:56:33,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:33,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:33,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:33,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:33,377 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:33,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:33,885 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:33,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [481847104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:33,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739966233] [2021-11-25 18:56:33,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:56:33,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:33,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:33,887 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:33,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 18:56:33,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:56:33,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:56:33,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:56:33,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:34,192 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:34,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:34,724 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:56:34,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739966233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:34,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:56:34,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 11 [2021-11-25 18:56:34,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340100293] [2021-11-25 18:56:34,725 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:56:34,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:56:34,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:56:34,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:56:34,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:56:34,727 INFO L87 Difference]: Start difference. First operand 100 states and 144 transitions. Second operand has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:35,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:56:35,261 INFO L93 Difference]: Finished difference Result 111 states and 155 transitions. [2021-11-25 18:56:35,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:56:35,262 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 66 [2021-11-25 18:56:35,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:56:35,263 INFO L225 Difference]: With dead ends: 111 [2021-11-25 18:56:35,263 INFO L226 Difference]: Without dead ends: 97 [2021-11-25 18:56:35,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 381 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:56:35,265 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 144 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:56:35,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 335 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:56:35,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-25 18:56:35,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-11-25 18:56:35,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 71 states have (on average 1.1971830985915493) internal successors, (85), 76 states have internal predecessors, (85), 15 states have call successors, (15), 5 states have call predecessors, (15), 10 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-25 18:56:35,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 139 transitions. [2021-11-25 18:56:35,291 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 139 transitions. Word has length 66 [2021-11-25 18:56:35,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:56:35,292 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 139 transitions. [2021-11-25 18:56:35,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.363636363636363) internal successors, (48), 11 states have internal predecessors, (48), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 18:56:35,293 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 139 transitions. [2021-11-25 18:56:35,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:56:35,294 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:56:35,295 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:56:35,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:35,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-25 18:56:35,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-25 18:56:35,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:56:35,897 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:56:35,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:56:35,898 INFO L85 PathProgramCache]: Analyzing trace with hash -425811905, now seen corresponding path program 1 times [2021-11-25 18:56:35,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:56:35,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [629544230] [2021-11-25 18:56:35,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:35,898 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:56:35,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:56:35,899 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:56:35,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-25 18:56:35,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:35,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:56:35,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:37,345 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:56:37,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:40,483 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:56:40,483 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:56:40,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [629544230] [2021-11-25 18:56:40,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [629544230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:40,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1388769016] [2021-11-25 18:56:40,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:40,483 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:56:40,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:56:40,485 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:56:40,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-25 18:56:40,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:40,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 18:56:40,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:43,549 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:56:43,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:56:49,775 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:56:49,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1388769016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:56:49,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551061056] [2021-11-25 18:56:49,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:56:49,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:56:49,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:56:49,779 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:56:49,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 18:56:49,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:56:49,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 18:56:49,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:56:53,812 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:56:53,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:57:03,510 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:57:03,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551061056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:57:03,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:57:03,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 16, 16, 17, 17] total 65 [2021-11-25 18:57:03,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853504639] [2021-11-25 18:57:03,511 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:57:03,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 18:57:03,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:57:03,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 18:57:03,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=3713, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 18:57:03,514 INFO L87 Difference]: Start difference. First operand 97 states and 139 transitions. Second operand has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:57:27,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:57:27,979 INFO L93 Difference]: Finished difference Result 170 states and 236 transitions. [2021-11-25 18:57:27,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 18:57:27,995 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) Word has length 73 [2021-11-25 18:57:27,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:57:27,997 INFO L225 Difference]: With dead ends: 170 [2021-11-25 18:57:27,997 INFO L226 Difference]: Without dead ends: 121 [2021-11-25 18:57:28,001 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 367 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2361 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=1543, Invalid=7577, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 18:57:28,002 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 359 mSDsluCounter, 1588 mSDsCounter, 0 mSdLazyCounter, 1146 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 1669 SdHoareTripleChecker+Invalid, 1388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 1146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:57:28,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 1669 Invalid, 1388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 1146 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2021-11-25 18:57:28,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-25 18:57:28,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 102. [2021-11-25 18:57:28,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 80 states have internal predecessors, (88), 16 states have call successors, (16), 5 states have call predecessors, (16), 11 states have return successors, (43), 16 states have call predecessors, (43), 15 states have call successors, (43) [2021-11-25 18:57:28,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 147 transitions. [2021-11-25 18:57:28,015 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 147 transitions. Word has length 73 [2021-11-25 18:57:28,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:57:28,015 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 147 transitions. [2021-11-25 18:57:28,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.8153846153846154) internal successors, (118), 65 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:57:28,016 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 147 transitions. [2021-11-25 18:57:28,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:57:28,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:57:28,018 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:57:28,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 18:57:28,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-25 18:57:28,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-25 18:57:28,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:57:28,619 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:57:28,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:57:28,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1804933507, now seen corresponding path program 2 times [2021-11-25 18:57:28,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:57:28,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [399007623] [2021-11-25 18:57:28,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:57:28,620 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:57:28,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:57:28,620 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:57:28,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-25 18:57:28,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:57:28,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:57:28,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:57:28,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:57:30,227 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:57:30,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:57:33,452 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:57:33,452 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:57:33,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [399007623] [2021-11-25 18:57:33,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [399007623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:57:33,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [243338791] [2021-11-25 18:57:33,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:57:33,453 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:57:33,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:57:33,454 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:57:33,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-25 18:57:33,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:57:33,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:57:33,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:57:33,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:57:36,158 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:57:36,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:57:42,307 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:57:42,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [243338791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:57:42,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547484490] [2021-11-25 18:57:42,307 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:57:42,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:57:42,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:57:42,308 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:57:42,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 18:57:42,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:57:42,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:57:42,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 18:57:42,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:57:46,139 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:57:46,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:57:55,526 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:57:55,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547484490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:57:55,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:57:55,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 17, 17] total 64 [2021-11-25 18:57:55,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381814267] [2021-11-25 18:57:55,527 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:57:55,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-25 18:57:55,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:57:55,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-25 18:57:55,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=3612, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 18:57:55,530 INFO L87 Difference]: Start difference. First operand 102 states and 147 transitions. Second operand has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:58:23,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:23,722 INFO L93 Difference]: Finished difference Result 180 states and 243 transitions. [2021-11-25 18:58:23,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 18:58:23,724 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) Word has length 73 [2021-11-25 18:58:23,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:23,726 INFO L225 Difference]: With dead ends: 180 [2021-11-25 18:58:23,726 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 18:58:23,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 369 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2239 ImplicationChecksByTransitivity, 38.9s TimeCoverageRelationStatistics Valid=1519, Invalid=7411, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 18:58:23,731 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 450 mSDsluCounter, 1595 mSDsCounter, 0 mSdLazyCounter, 1127 mSolverCounterSat, 307 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 1669 SdHoareTripleChecker+Invalid, 1434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 307 IncrementalHoareTripleChecker+Valid, 1127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:23,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [454 Valid, 1669 Invalid, 1434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [307 Valid, 1127 Invalid, 0 Unknown, 0 Unchecked, 8.1s Time] [2021-11-25 18:58:23,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 18:58:23,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 100. [2021-11-25 18:58:23,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 79 states have internal predecessors, (87), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (39), 15 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-25 18:58:23,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 141 transitions. [2021-11-25 18:58:23,752 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 141 transitions. Word has length 73 [2021-11-25 18:58:23,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:23,753 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 141 transitions. [2021-11-25 18:58:23,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.84375) internal successors, (118), 64 states have internal predecessors, (118), 15 states have call successors, (18), 2 states have call predecessors, (18), 8 states have return successors, (21), 15 states have call predecessors, (21), 14 states have call successors, (21) [2021-11-25 18:58:23,753 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 141 transitions. [2021-11-25 18:58:23,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:58:23,755 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:23,755 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:23,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:23,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:24,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:24,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:58:24,358 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:24,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:24,359 INFO L85 PathProgramCache]: Analyzing trace with hash 774759652, now seen corresponding path program 1 times [2021-11-25 18:58:24,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:58:24,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1427268199] [2021-11-25 18:58:24,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:24,360 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:58:24,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:58:24,361 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:58:24,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-25 18:58:24,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:24,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:58:24,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:24,821 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 18:58:24,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:58:24,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:58:24,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1427268199] [2021-11-25 18:58:24,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1427268199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:58:24,822 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:58:24,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:58:24,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935657262] [2021-11-25 18:58:24,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:58:24,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:58:24,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:58:24,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:58:24,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:58:24,824 INFO L87 Difference]: Start difference. First operand 100 states and 141 transitions. Second operand has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 18:58:25,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:25,070 INFO L93 Difference]: Finished difference Result 114 states and 156 transitions. [2021-11-25 18:58:25,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:58:25,071 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 75 [2021-11-25 18:58:25,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:25,073 INFO L225 Difference]: With dead ends: 114 [2021-11-25 18:58:25,073 INFO L226 Difference]: Without dead ends: 105 [2021-11-25 18:58:25,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:58:25,074 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 7 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:25,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 407 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:58:25,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-25 18:58:25,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2021-11-25 18:58:25,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 73 states have (on average 1.1917808219178083) internal successors, (87), 79 states have internal predecessors, (87), 15 states have call successors, (15), 5 states have call predecessors, (15), 11 states have return successors, (36), 15 states have call predecessors, (36), 14 states have call successors, (36) [2021-11-25 18:58:25,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 138 transitions. [2021-11-25 18:58:25,099 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 138 transitions. Word has length 75 [2021-11-25 18:58:25,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:25,100 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 138 transitions. [2021-11-25 18:58:25,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-25 18:58:25,100 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 138 transitions. [2021-11-25 18:58:25,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:58:25,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:25,102 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:25,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:25,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 18:58:25,315 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:25,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:25,315 INFO L85 PathProgramCache]: Analyzing trace with hash 700030255, now seen corresponding path program 1 times [2021-11-25 18:58:25,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:58:25,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [173202924] [2021-11-25 18:58:25,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:25,316 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:58:25,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:58:25,317 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:58:25,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-25 18:58:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:25,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:58:25,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:26,770 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:58:26,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:58:29,948 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:58:29,948 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:58:29,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [173202924] [2021-11-25 18:58:29,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [173202924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:29,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1732724298] [2021-11-25 18:58:29,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:29,949 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:58:29,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:58:29,958 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:58:29,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-25 18:58:30,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:30,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:58:30,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:32,679 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:58:32,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:58:39,326 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:58:39,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1732724298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:39,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081103122] [2021-11-25 18:58:39,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:58:39,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:39,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:58:39,328 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:58:39,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 18:58:39,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:58:39,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:58:39,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:40,078 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:58:40,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:58:42,354 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:58:42,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081103122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:58:42,354 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:58:42,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-25 18:58:42,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018105645] [2021-11-25 18:58:42,355 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:58:42,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:58:42,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:58:42,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:58:42,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1560, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 18:58:42,357 INFO L87 Difference]: Start difference. First operand 100 states and 138 transitions. Second operand has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 18:58:55,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:58:55,349 INFO L93 Difference]: Finished difference Result 139 states and 184 transitions. [2021-11-25 18:58:55,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:58:55,352 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 75 [2021-11-25 18:58:55,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:58:55,354 INFO L225 Difference]: With dead ends: 139 [2021-11-25 18:58:55,354 INFO L226 Difference]: Without dead ends: 116 [2021-11-25 18:58:55,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=650, Invalid=3010, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:58:55,357 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 345 mSDsluCounter, 864 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 939 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 18:58:55,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 939 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 536 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-25 18:58:55,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-25 18:58:55,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-11-25 18:58:55,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.178082191780822) internal successors, (86), 77 states have internal predecessors, (86), 15 states have call successors, (15), 6 states have call predecessors, (15), 10 states have return successors, (31), 15 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-25 18:58:55,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 132 transitions. [2021-11-25 18:58:55,373 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 132 transitions. Word has length 75 [2021-11-25 18:58:55,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:58:55,374 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 132 transitions. [2021-11-25 18:58:55,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 18:58:55,374 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 132 transitions. [2021-11-25 18:58:55,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:58:55,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:58:55,376 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:58:55,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:55,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Ended with exit code 0 [2021-11-25 18:58:55,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 18:58:56,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:58:56,011 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:58:56,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:58:56,011 INFO L85 PathProgramCache]: Analyzing trace with hash 904822259, now seen corresponding path program 2 times [2021-11-25 18:58:56,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:58:56,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [542941137] [2021-11-25 18:58:56,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:58:56,012 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:58:56,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:58:56,012 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:58:56,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-25 18:58:56,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:58:56,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:58:56,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:58:56,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:58:57,519 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:58:57,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:59:00,677 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:59:00,678 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:59:00,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [542941137] [2021-11-25 18:59:00,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [542941137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:59:00,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [803572005] [2021-11-25 18:59:00,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:59:00,678 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:59:00,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:59:00,679 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:59:00,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-25 18:59:00,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:59:00,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:59:00,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:59:00,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:03,355 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:59:03,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:59:09,895 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:59:09,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [803572005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:59:09,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672577579] [2021-11-25 18:59:09,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 18:59:09,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:59:09,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:59:09,897 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:59:09,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 18:59:09,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 18:59:09,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:59:09,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 18:59:09,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:10,633 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:59:10,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:59:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:59:13,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672577579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:59:13,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 18:59:13,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 15, 16, 15, 16] total 43 [2021-11-25 18:59:13,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660594838] [2021-11-25 18:59:13,111 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 18:59:13,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:59:13,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 18:59:13,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:59:13,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1569, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 18:59:13,113 INFO L87 Difference]: Start difference. First operand 99 states and 132 transitions. Second operand has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 18:59:26,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:59:26,215 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2021-11-25 18:59:26,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:59:26,216 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) Word has length 75 [2021-11-25 18:59:26,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:59:26,217 INFO L225 Difference]: With dead ends: 128 [2021-11-25 18:59:26,217 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 18:59:26,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=633, Invalid=3027, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:59:26,219 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 314 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 1114 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:59:26,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 1114 Invalid, 716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-25 18:59:26,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 18:59:26,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 96. [2021-11-25 18:59:26,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 71 states have (on average 1.1690140845070423) internal successors, (83), 74 states have internal predecessors, (83), 15 states have call successors, (15), 6 states have call predecessors, (15), 9 states have return successors, (28), 15 states have call predecessors, (28), 14 states have call successors, (28) [2021-11-25 18:59:26,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 126 transitions. [2021-11-25 18:59:26,235 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 126 transitions. Word has length 75 [2021-11-25 18:59:26,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:59:26,236 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 126 transitions. [2021-11-25 18:59:26,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.13953488372093) internal successors, (92), 43 states have internal predecessors, (92), 11 states have call successors, (14), 2 states have call predecessors, (14), 6 states have return successors, (15), 11 states have call predecessors, (15), 10 states have call successors, (15) [2021-11-25 18:59:26,236 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 126 transitions. [2021-11-25 18:59:26,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 18:59:26,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:59:26,238 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:59:26,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Ended with exit code 0 [2021-11-25 18:59:26,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-25 18:59:26,670 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-25 18:59:26,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:59:26,841 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:59:26,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:59:26,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1627177794, now seen corresponding path program 1 times [2021-11-25 18:59:26,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 18:59:26,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1604424237] [2021-11-25 18:59:26,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:59:26,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 18:59:26,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 18:59:26,845 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 18:59:26,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-25 18:59:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:59:26,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 18:59:26,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:28,886 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:59:28,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:59:33,764 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:59:33,764 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 18:59:33,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1604424237] [2021-11-25 18:59:33,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1604424237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:59:33,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1667695662] [2021-11-25 18:59:33,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:59:33,765 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 18:59:33,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 18:59:33,766 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 18:59:33,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-25 18:59:33,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:59:33,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 18:59:33,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:38,536 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:59:38,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:59:48,814 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:59:48,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1667695662] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:59:48,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047895380] [2021-11-25 18:59:48,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:59:48,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:59:48,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:59:48,816 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:59:48,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 18:59:49,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:59:49,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 18:59:49,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:59:56,443 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:59:56,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:00:20,157 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:00:20,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047895380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:00:20,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:00:20,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 21, 23] total 86 [2021-11-25 19:00:20,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071576678] [2021-11-25 19:00:20,158 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:00:20,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 19:00:20,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:00:20,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 19:00:20,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=6492, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 19:00:20,164 INFO L87 Difference]: Start difference. First operand 96 states and 126 transitions. Second operand has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 19:01:02,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:01:02,692 INFO L93 Difference]: Finished difference Result 143 states and 185 transitions. [2021-11-25 19:01:02,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 19:01:02,694 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 82 [2021-11-25 19:01:02,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:01:02,700 INFO L225 Difference]: With dead ends: 143 [2021-11-25 19:01:02,700 INFO L226 Difference]: Without dead ends: 129 [2021-11-25 19:01:02,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3837 ImplicationChecksByTransitivity, 66.3s TimeCoverageRelationStatistics Valid=1674, Invalid=11898, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:01:02,706 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 347 mSDsluCounter, 2059 mSDsCounter, 0 mSdLazyCounter, 2027 mSolverCounterSat, 281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 2121 SdHoareTripleChecker+Invalid, 2308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 281 IncrementalHoareTripleChecker+Valid, 2027 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:01:02,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 2121 Invalid, 2308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [281 Valid, 2027 Invalid, 0 Unknown, 0 Unchecked, 18.1s Time] [2021-11-25 19:01:02,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-25 19:01:02,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 105. [2021-11-25 19:01:02,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 77 states have (on average 1.155844155844156) internal successors, (89), 80 states have internal predecessors, (89), 17 states have call successors, (17), 6 states have call predecessors, (17), 10 states have return successors, (32), 18 states have call predecessors, (32), 16 states have call successors, (32) [2021-11-25 19:01:02,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 138 transitions. [2021-11-25 19:01:02,724 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 138 transitions. Word has length 82 [2021-11-25 19:01:02,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:01:02,724 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 138 transitions. [2021-11-25 19:01:02,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 84 states have (on average 1.6785714285714286) internal successors, (141), 83 states have internal predecessors, (141), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 19:01:02,725 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 138 transitions. [2021-11-25 19:01:02,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:01:02,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:01:02,727 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:01:02,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 0 [2021-11-25 19:01:02,938 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Ended with exit code 0 [2021-11-25 19:01:03,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-25 19:01:03,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:01:03,330 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:01:03,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:01:03,330 INFO L85 PathProgramCache]: Analyzing trace with hash -2114830850, now seen corresponding path program 2 times [2021-11-25 19:01:03,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:01:03,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1846757144] [2021-11-25 19:01:03,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:01:03,330 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:01:03,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:01:03,331 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:01:03,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-25 19:01:03,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:01:03,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:01:03,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 19:01:03,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:01:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:01:05,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:01:10,684 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:01:10,684 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:01:10,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1846757144] [2021-11-25 19:01:10,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1846757144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:01:10,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1330521315] [2021-11-25 19:01:10,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:01:10,685 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:01:10,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:01:10,691 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:01:10,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-25 19:01:10,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:01:10,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:01:10,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 19:01:10,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:01:15,720 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:01:15,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:01:26,526 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:01:26,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1330521315] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:01:26,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067622967] [2021-11-25 19:01:26,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:01:26,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:01:26,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:01:26,529 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:01:26,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 19:01:26,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:01:26,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:01:26,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 19:01:26,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:01:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:01:33,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:01:58,700 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:01:58,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067622967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:01:58,701 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:01:58,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 24] total 85 [2021-11-25 19:01:58,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234721341] [2021-11-25 19:01:58,701 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:01:58,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-25 19:01:58,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:01:58,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-25 19:01:58,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=795, Invalid=6345, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 19:01:58,704 INFO L87 Difference]: Start difference. First operand 105 states and 138 transitions. Second operand has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 19:02:56,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:02:56,697 INFO L93 Difference]: Finished difference Result 161 states and 199 transitions. [2021-11-25 19:02:56,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 19:02:56,698 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) Word has length 82 [2021-11-25 19:02:56,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:02:56,700 INFO L225 Difference]: With dead ends: 161 [2021-11-25 19:02:56,700 INFO L226 Difference]: Without dead ends: 140 [2021-11-25 19:02:56,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3948 ImplicationChecksByTransitivity, 82.4s TimeCoverageRelationStatistics Valid=1899, Invalid=12863, Unknown=0, NotChecked=0, Total=14762 [2021-11-25 19:02:56,704 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 340 mSDsluCounter, 2074 mSDsCounter, 0 mSdLazyCounter, 2237 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 2135 SdHoareTripleChecker+Invalid, 2511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 2237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:02:56,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 2135 Invalid, 2511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 2237 Invalid, 0 Unknown, 0 Unchecked, 18.4s Time] [2021-11-25 19:02:56,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-25 19:02:56,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 114. [2021-11-25 19:02:56,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 85 states have (on average 1.1529411764705881) internal successors, (98), 87 states have internal predecessors, (98), 18 states have call successors, (18), 7 states have call predecessors, (18), 10 states have return successors, (31), 19 states have call predecessors, (31), 17 states have call successors, (31) [2021-11-25 19:02:56,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 147 transitions. [2021-11-25 19:02:56,724 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 147 transitions. Word has length 82 [2021-11-25 19:02:56,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:02:56,724 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 147 transitions. [2021-11-25 19:02:56,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 83 states have (on average 1.6506024096385543) internal successors, (137), 82 states have internal predecessors, (137), 19 states have call successors, (22), 2 states have call predecessors, (22), 10 states have return successors, (25), 20 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-25 19:02:56,725 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 147 transitions. [2021-11-25 19:02:56,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 19:02:56,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:02:56,726 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:02:56,743 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Ended with exit code 0 [2021-11-25 19:02:56,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Ended with exit code 0 [2021-11-25 19:02:57,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-25 19:02:57,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:02:57,329 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:02:57,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:02:57,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1402295107, now seen corresponding path program 1 times [2021-11-25 19:02:57,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:02:57,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2042612449] [2021-11-25 19:02:57,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:02:57,330 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:02:57,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:02:57,331 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:02:57,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-25 19:02:57,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:02:57,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:02:57,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:02:58,059 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:02:58,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:02:59,232 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:02:59,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:02:59,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2042612449] [2021-11-25 19:02:59,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2042612449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:02:59,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1947088182] [2021-11-25 19:02:59,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:02:59,233 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:02:59,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:02:59,236 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:02:59,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-25 19:02:59,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:02:59,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:02:59,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:02:59,796 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:02:59,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:00,572 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:00,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1947088182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226562113] [2021-11-25 19:03:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:00,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:03:00,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:03:00,573 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:03:00,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 19:03:00,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:00,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:03:00,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:03:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:00,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:01,721 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:01,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226562113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:01,721 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:03:01,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 15 [2021-11-25 19:03:01,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547786121] [2021-11-25 19:03:01,722 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:03:01,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:03:01,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:03:01,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:03:01,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:03:01,723 INFO L87 Difference]: Start difference. First operand 114 states and 147 transitions. Second operand has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 19:03:03,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:03:03,398 INFO L93 Difference]: Finished difference Result 123 states and 155 transitions. [2021-11-25 19:03:03,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 19:03:03,399 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 83 [2021-11-25 19:03:03,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:03:03,400 INFO L225 Difference]: With dead ends: 123 [2021-11-25 19:03:03,400 INFO L226 Difference]: Without dead ends: 112 [2021-11-25 19:03:03,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:03:03,401 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 135 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:03:03,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 681 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:03:03,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-25 19:03:03,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-11-25 19:03:03,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 84 states have (on average 1.1547619047619047) internal successors, (97), 86 states have internal predecessors, (97), 17 states have call successors, (17), 7 states have call predecessors, (17), 10 states have return successors, (29), 18 states have call predecessors, (29), 16 states have call successors, (29) [2021-11-25 19:03:03,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 143 transitions. [2021-11-25 19:03:03,417 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 143 transitions. Word has length 83 [2021-11-25 19:03:03,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:03:03,418 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 143 transitions. [2021-11-25 19:03:03,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 19:03:03,418 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 143 transitions. [2021-11-25 19:03:03,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 19:03:03,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:03:03,420 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:03:03,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-25 19:03:03,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 19:03:03,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-25 19:03:04,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:03:04,022 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:03:04,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:03:04,023 INFO L85 PathProgramCache]: Analyzing trace with hash 1128450436, now seen corresponding path program 1 times [2021-11-25 19:03:04,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:03:04,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [763797137] [2021-11-25 19:03:04,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:04,024 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:03:04,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:03:04,024 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:03:04,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-25 19:03:04,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:04,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 19:03:04,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:03:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:03:06,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:10,942 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:10,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:03:10,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [763797137] [2021-11-25 19:03:10,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [763797137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:10,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [219464667] [2021-11-25 19:03:10,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:10,943 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:03:10,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:03:10,944 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:03:10,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-25 19:03:11,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:11,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 19:03:11,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:03:15,640 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:03:15,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:25,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [219464667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:25,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505318380] [2021-11-25 19:03:25,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:03:25,460 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:03:25,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:03:25,461 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:03:25,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 19:03:25,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:03:25,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 19:03:25,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:03:33,559 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:03:33,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:03:49,875 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:03:49,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505318380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:03:49,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:03:49,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 17, 22, 24] total 82 [2021-11-25 19:03:49,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225016247] [2021-11-25 19:03:49,876 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:03:49,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-25 19:03:49,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:03:49,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-25 19:03:49,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=6043, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 19:03:49,877 INFO L87 Difference]: Start difference. First operand 112 states and 143 transitions. Second operand has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:04:28,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:04:28,162 INFO L93 Difference]: Finished difference Result 156 states and 190 transitions. [2021-11-25 19:04:28,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 19:04:28,164 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) Word has length 80 [2021-11-25 19:04:28,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:04:28,165 INFO L225 Difference]: With dead ends: 156 [2021-11-25 19:04:28,166 INFO L226 Difference]: Without dead ends: 136 [2021-11-25 19:04:28,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 393 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3706 ImplicationChecksByTransitivity, 54.3s TimeCoverageRelationStatistics Valid=1678, Invalid=11894, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:04:28,168 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 250 mSDsluCounter, 2463 mSDsCounter, 0 mSdLazyCounter, 2249 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 2535 SdHoareTripleChecker+Invalid, 2503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 2249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:04:28,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 2535 Invalid, 2503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 2249 Invalid, 0 Unknown, 0 Unchecked, 18.5s Time] [2021-11-25 19:04:28,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-25 19:04:28,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 121. [2021-11-25 19:04:28,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 92 states have (on average 1.141304347826087) internal successors, (105), 93 states have internal predecessors, (105), 18 states have call successors, (18), 8 states have call predecessors, (18), 10 states have return successors, (27), 19 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-25 19:04:28,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 150 transitions. [2021-11-25 19:04:28,195 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 150 transitions. Word has length 80 [2021-11-25 19:04:28,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:04:28,196 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 150 transitions. [2021-11-25 19:04:28,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 80 states have (on average 1.675) internal successors, (134), 79 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:04:28,197 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 150 transitions. [2021-11-25 19:04:28,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 19:04:28,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:04:28,198 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:04:28,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Ended with exit code 0 [2021-11-25 19:04:28,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-25 19:04:28,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 19:04:28,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:04:28,812 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:04:28,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:04:28,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1440446079, now seen corresponding path program 2 times [2021-11-25 19:04:28,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:04:28,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [892357017] [2021-11-25 19:04:28,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:28,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:04:28,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:04:28,814 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:04:28,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-25 19:04:28,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:28,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:28,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:04:28,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:04:29,565 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:29,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:04:30,668 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:30,668 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:04:30,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [892357017] [2021-11-25 19:04:30,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [892357017] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:04:30,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1492855746] [2021-11-25 19:04:30,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:30,668 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:04:30,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:04:30,669 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:04:30,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-25 19:04:30,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:30,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:30,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:04:30,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:04:31,114 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:31,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:04:31,792 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:31,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1492855746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:04:31,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632758806] [2021-11-25 19:04:31,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:31,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:04:31,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:04:31,793 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:04:31,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 19:04:31,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:31,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:31,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:04:31,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:04:32,190 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:32,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:04:32,844 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:32,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632758806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:04:32,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:04:32,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 15 [2021-11-25 19:04:32,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769306689] [2021-11-25 19:04:32,845 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:04:32,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:04:32,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:04:32,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:04:32,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:04:32,846 INFO L87 Difference]: Start difference. First operand 121 states and 150 transitions. Second operand has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 19:04:34,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:04:34,401 INFO L93 Difference]: Finished difference Result 128 states and 156 transitions. [2021-11-25 19:04:34,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:04:34,401 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 83 [2021-11-25 19:04:34,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:04:34,403 INFO L225 Difference]: With dead ends: 128 [2021-11-25 19:04:34,403 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 19:04:34,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:04:34,404 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 115 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:04:34,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 741 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:04:34,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 19:04:34,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-11-25 19:04:34,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 87 states have (on average 1.1379310344827587) internal successors, (99), 88 states have internal predecessors, (99), 17 states have call successors, (17), 8 states have call predecessors, (17), 9 states have return successors, (24), 17 states have call predecessors, (24), 16 states have call successors, (24) [2021-11-25 19:04:34,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 140 transitions. [2021-11-25 19:04:34,434 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 140 transitions. Word has length 83 [2021-11-25 19:04:34,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:04:34,434 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 140 transitions. [2021-11-25 19:04:34,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 15 states have internal predecessors, (67), 8 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-25 19:04:34,435 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 140 transitions. [2021-11-25 19:04:34,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 19:04:34,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:04:34,436 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:04:34,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 0 [2021-11-25 19:04:34,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-25 19:04:34,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-25 19:04:35,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:04:35,048 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:04:35,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:04:35,048 INFO L85 PathProgramCache]: Analyzing trace with hash -1457098876, now seen corresponding path program 2 times [2021-11-25 19:04:35,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:04:35,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [32206772] [2021-11-25 19:04:35,048 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:35,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:04:35,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:04:35,050 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:04:35,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-25 19:04:35,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:35,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:35,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 19:04:35,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:04:37,027 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:04:37,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:04:41,588 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:41,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:04:41,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [32206772] [2021-11-25 19:04:41,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [32206772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:04:41,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [653086307] [2021-11-25 19:04:41,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:41,589 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:04:41,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:04:41,590 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:04:41,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-25 19:04:41,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:41,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:41,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 19:04:41,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:04:45,931 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:04:45,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:04:54,932 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:04:54,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [653086307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:04:54,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47116365] [2021-11-25 19:04:54,933 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:04:54,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:04:54,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:04:54,933 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:04:54,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-25 19:04:55,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:04:55,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:04:55,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 19:04:55,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:05:02,477 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:05:02,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:05:16,606 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:05:16,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47116365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:05:16,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:05:16,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 18, 18, 22, 23] total 81 [2021-11-25 19:05:16,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469805586] [2021-11-25 19:05:16,607 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:05:16,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 19:05:16,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:05:16,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 19:05:16,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=5902, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 19:05:16,609 INFO L87 Difference]: Start difference. First operand 114 states and 140 transitions. Second operand has 81 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:05:58,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:05:58,518 INFO L93 Difference]: Finished difference Result 165 states and 195 transitions. [2021-11-25 19:05:58,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 19:05:58,520 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) Word has length 80 [2021-11-25 19:05:58,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:05:58,521 INFO L225 Difference]: With dead ends: 165 [2021-11-25 19:05:58,521 INFO L226 Difference]: Without dead ends: 125 [2021-11-25 19:05:58,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 393 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3593 ImplicationChecksByTransitivity, 59.2s TimeCoverageRelationStatistics Valid=1786, Invalid=11786, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:05:58,526 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 257 mSDsluCounter, 1955 mSDsCounter, 0 mSdLazyCounter, 1850 mSolverCounterSat, 286 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 2136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 286 IncrementalHoareTripleChecker+Valid, 1850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:05:58,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 2027 Invalid, 2136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [286 Valid, 1850 Invalid, 0 Unknown, 0 Unchecked, 14.2s Time] [2021-11-25 19:05:58,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-25 19:05:58,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2021-11-25 19:05:58,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 93 states have (on average 1.118279569892473) internal successors, (104), 92 states have internal predecessors, (104), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (22), 18 states have call predecessors, (22), 17 states have call successors, (22) [2021-11-25 19:05:58,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 144 transitions. [2021-11-25 19:05:58,543 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 144 transitions. Word has length 80 [2021-11-25 19:05:58,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:05:58,548 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 144 transitions. [2021-11-25 19:05:58,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 79 states have (on average 1.6962025316455696) internal successors, (134), 78 states have internal predecessors, (134), 20 states have call successors, (23), 2 states have call predecessors, (23), 10 states have return successors, (26), 21 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:05:58,548 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 144 transitions. [2021-11-25 19:05:58,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 19:05:58,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:05:58,550 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:05:58,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:58,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:58,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 0 [2021-11-25 19:05:59,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:05:59,164 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:05:59,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:05:59,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1087775420, now seen corresponding path program 1 times [2021-11-25 19:05:59,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:05:59,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [543232098] [2021-11-25 19:05:59,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:05:59,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:05:59,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:05:59,166 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:05:59,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-25 19:05:59,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:05:59,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 19:05:59,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:03,966 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 19:06:03,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:17,008 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 19:06:17,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:06:17,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [543232098] [2021-11-25 19:06:17,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [543232098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:17,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1501568247] [2021-11-25 19:06:17,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:17,009 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:06:17,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:06:17,010 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:06:17,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-25 19:06:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:06:17,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 19:06:17,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:06:32,538 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 19:06:32,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:06:59,785 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 19:06:59,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1501568247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:06:59,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059605782] [2021-11-25 19:06:59,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:06:59,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:06:59,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:06:59,787 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:06:59,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7b1ecdbb-59c8-442a-adb3-22a414aa00ee/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-25 19:07:00,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:07:00,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 19:07:00,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:07:06,562 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 11 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 19:07:06,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:07:19,045 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 11 proven. 20 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 19:07:19,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059605782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:07:19,046 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:07:19,046 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 26, 25, 28, 28] total 91 [2021-11-25 19:07:19,046 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757458237] [2021-11-25 19:07:19,046 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:07:19,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 19:07:19,047 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:07:19,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 19:07:19,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=7744, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 19:07:19,049 INFO L87 Difference]: Start difference. First operand 120 states and 144 transitions. Second operand has 91 states, 86 states have (on average 1.5116279069767442) internal successors, (130), 84 states have internal predecessors, (130), 22 states have call successors, (25), 2 states have call predecessors, (25), 10 states have return successors, (28), 23 states have call predecessors, (28), 21 states have call successors, (28)