./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.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_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/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_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/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_00c5b1d8-0a2f-4046-a531-6b75d96cc755/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 8262fd4bdb4bed8fef0fbefd142e15775d81a64587fab0af0aa2004f91ae895c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:47:18,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:47:18,359 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:47:18,390 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:47:18,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:47:18,392 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:47:18,394 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:47:18,396 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:47:18,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:47:18,399 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:47:18,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:47:18,402 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:47:18,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:47:18,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:47:18,409 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:47:18,411 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:47:18,413 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:47:18,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:47:18,421 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:47:18,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:47:18,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:47:18,435 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:47:18,436 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:47:18,439 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:47:18,442 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:47:18,447 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:47:18,447 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:47:18,449 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:47:18,450 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:47:18,452 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:47:18,453 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:47:18,454 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:47:18,456 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:47:18,457 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:47:18,458 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:47:18,459 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:47:18,460 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:47:18,460 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:47:18,460 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:47:18,461 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:47:18,462 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:47:18,462 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:47:18,512 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:47:18,514 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:47:18,515 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:47:18,515 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:47:18,522 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:47:18,522 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:47:18,522 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:47:18,523 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:47:18,523 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:47:18,523 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:47:18,524 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:47:18,525 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:47:18,525 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:47:18,525 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:47:18,525 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:47:18,526 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:47:18,526 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:47:18,526 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:47:18,528 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:47:18,528 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:47:18,528 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:47:18,528 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:47:18,529 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:47:18,529 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:47:18,529 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:47:18,529 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:47:18,531 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:47:18,532 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:47:18,532 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:47:18,532 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:47:18,532 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:47:18,533 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:47:18,533 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:18,533 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:47:18,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:47:18,534 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:47:18,534 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:47:18,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:47:18,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:47:18,535 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:47:18,535 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:47:18,535 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8262fd4bdb4bed8fef0fbefd142e15775d81a64587fab0af0aa2004f91ae895c [2021-11-25 18:47:18,827 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:47:18,870 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:47:18,873 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:47:18,874 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:47:18,875 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:47:18,876 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c [2021-11-25 18:47:18,951 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/data/ca36bed04/60bf1df76489491e98d59957abebe5be/FLAG8a6f371f3 [2021-11-25 18:47:19,402 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:47:19,403 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c [2021-11-25 18:47:19,415 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/data/ca36bed04/60bf1df76489491e98d59957abebe5be/FLAG8a6f371f3 [2021-11-25 18:47:19,778 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/data/ca36bed04/60bf1df76489491e98d59957abebe5be [2021-11-25 18:47:19,781 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:47:19,782 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:47:19,788 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:19,788 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:47:19,792 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:47:19,793 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:19" (1/1) ... [2021-11-25 18:47:19,795 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1dc74c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:19, skipping insertion in model container [2021-11-25 18:47:19,796 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:19" (1/1) ... [2021-11-25 18:47:19,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:47:19,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:47:19,992 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_00c5b1d8-0a2f-4046-a531-6b75d96cc755/sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c[423,436] [2021-11-25 18:47:20,008 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:20,015 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:47:20,028 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_00c5b1d8-0a2f-4046-a531-6b75d96cc755/sv-benchmarks/c/array-cav19/array_min_and_copy_shift_sum_add.c[423,436] [2021-11-25 18:47:20,036 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:20,049 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:47:20,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20 WrapperNode [2021-11-25 18:47:20,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:20,051 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:20,052 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:47:20,052 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:47:20,059 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,066 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,086 INFO L137 Inliner]: procedures = 15, calls = 24, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 84 [2021-11-25 18:47:20,086 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:20,087 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:47:20,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:47:20,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:47:20,095 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,096 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,098 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,098 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,104 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,108 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,109 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,111 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:47:20,112 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:47:20,112 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:47:20,113 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:47:20,114 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (1/1) ... [2021-11-25 18:47:20,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:20,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:20,142 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:47:20,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:47:20,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:47:20,194 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 18:47:20,194 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 18:47:20,194 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:47:20,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:47:20,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:47:20,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:47:20,195 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:47:20,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:47:20,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:47:20,271 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:47:20,272 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:47:20,456 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:47:20,506 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:47:20,506 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 18:47:20,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:20 BoogieIcfgContainer [2021-11-25 18:47:20,509 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:47:20,510 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:47:20,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:47:20,514 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:47:20,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:47:19" (1/3) ... [2021-11-25 18:47:20,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22bb3f02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:20, skipping insertion in model container [2021-11-25 18:47:20,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:20" (2/3) ... [2021-11-25 18:47:20,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22bb3f02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:20, skipping insertion in model container [2021-11-25 18:47:20,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:20" (3/3) ... [2021-11-25 18:47:20,517 INFO L111 eAbstractionObserver]: Analyzing ICFG array_min_and_copy_shift_sum_add.c [2021-11-25 18:47:20,522 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:47:20,522 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:47:20,570 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:47:20,577 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 18:47:20,577 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:47:20,596 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:47:20,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 18:47:20,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:20,602 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:20,603 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:20,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:20,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1232094444, now seen corresponding path program 1 times [2021-11-25 18:47:20,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:20,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487496206] [2021-11-25 18:47:20,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:20,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:20,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:20,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:47:20,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:20,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487496206] [2021-11-25 18:47:20,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487496206] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:47:20,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:47:20,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:47:20,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731821395] [2021-11-25 18:47:20,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:47:20,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:47:20,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:20,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:47:20,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:47:20,956 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:47:21,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:21,019 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-25 18:47:21,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:47:21,022 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2021-11-25 18:47:21,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:21,029 INFO L225 Difference]: With dead ends: 25 [2021-11-25 18:47:21,029 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 18:47:21,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:47:21,035 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:21,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 26 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:21,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 18:47:21,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-25 18:47:21,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:47:21,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-25 18:47:21,072 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 14 [2021-11-25 18:47:21,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:21,073 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-25 18:47:21,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 18:47:21,074 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-25 18:47:21,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 18:47:21,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:21,076 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:21,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:47:21,076 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:21,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:21,077 INFO L85 PathProgramCache]: Analyzing trace with hash -460272811, now seen corresponding path program 1 times [2021-11-25 18:47:21,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:21,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779585469] [2021-11-25 18:47:21,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:21,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:21,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:21,222 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:47:21,222 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:21,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779585469] [2021-11-25 18:47:21,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779585469] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:47:21,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:47:21,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:47:21,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585147135] [2021-11-25 18:47:21,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:47:21,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:47:21,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:21,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:47:21,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:47:21,226 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 18:47:21,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:21,277 INFO L93 Difference]: Finished difference Result 28 states and 37 transitions. [2021-11-25 18:47:21,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:47:21,278 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2021-11-25 18:47:21,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:21,279 INFO L225 Difference]: With dead ends: 28 [2021-11-25 18:47:21,279 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 18:47:21,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:47:21,281 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:21,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 37 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:21,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 18:47:21,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-11-25 18:47:21,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:47:21,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-11-25 18:47:21,289 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 15 [2021-11-25 18:47:21,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:21,290 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-11-25 18:47:21,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-25 18:47:21,290 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-11-25 18:47:21,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-25 18:47:21,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:21,291 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:21,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:47:21,292 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:21,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:21,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1912132504, now seen corresponding path program 1 times [2021-11-25 18:47:21,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:21,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073634280] [2021-11-25 18:47:21,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:21,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:21,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:21,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:47:21,716 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:21,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073634280] [2021-11-25 18:47:21,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073634280] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:21,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280597088] [2021-11-25 18:47:21,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:21,717 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:21,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:21,731 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:21,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:47:21,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:21,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 18:47:21,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:22,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 18:47:22,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 18:47:22,130 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:47:22,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:22,277 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 18:47:22,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 39 [2021-11-25 18:47:22,374 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:47:22,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280597088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:22,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [239754288] [2021-11-25 18:47:22,395 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:22,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:22,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:22,404 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:22,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:22,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:22,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:22,688 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:22,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:22,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:22,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:22,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:22,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:47:25,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:25,195 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:25,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:25,284 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:47:25,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:47:26,577 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:26,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:26,609 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:26,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:26,707 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:26,709 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:27,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '304#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:27,757 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:27,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:27,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 21 [2021-11-25 18:47:27,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419028101] [2021-11-25 18:47:27,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:27,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 18:47:27,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:27,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 18:47:27,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:47:27,762 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 18:47:27,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:27,945 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-11-25 18:47:27,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 18:47:27,946 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 21 [2021-11-25 18:47:27,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:27,947 INFO L225 Difference]: With dead ends: 26 [2021-11-25 18:47:27,947 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 18:47:27,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=1023, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 18:47:27,950 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:27,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 97 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 173 Invalid, 0 Unknown, 20 Unchecked, 0.1s Time] [2021-11-25 18:47:27,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 18:47:27,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2021-11-25 18:47:27,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:47:27,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-25 18:47:27,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 21 [2021-11-25 18:47:27,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:27,961 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-25 18:47:27,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 18:47:27,961 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-25 18:47:27,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 18:47:27,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:27,962 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:27,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:47:28,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:28,163 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:28,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:28,163 INFO L85 PathProgramCache]: Analyzing trace with hash -853929431, now seen corresponding path program 2 times [2021-11-25 18:47:28,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:28,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353442586] [2021-11-25 18:47:28,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:28,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:28,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:28,259 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:47:28,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:28,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353442586] [2021-11-25 18:47:28,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353442586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:28,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184108436] [2021-11-25 18:47:28,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:47:28,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:28,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:28,262 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:28,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:47:28,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:47:28,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:28,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:47:28,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:28,413 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:47:28,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:28,479 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:47:28,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184108436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:28,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1285386864] [2021-11-25 18:47:28,483 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:28,483 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:28,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:28,483 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:28,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:28,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:28,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:28,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:28,666 INFO L354 Elim1Store]: treesize reduction 70, result has 35.2 percent of original size [2021-11-25 18:47:28,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 59 [2021-11-25 18:47:28,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:28,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:28,750 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:28,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:31,434 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:31,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:31,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:31,516 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:47:31,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:47:32,085 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:32,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:32,187 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:32,188 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:32,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '529#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:32,911 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:32,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:32,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-11-25 18:47:32,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181148771] [2021-11-25 18:47:32,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:32,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:47:32,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:32,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:47:32,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:47:32,915 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 18:47:33,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:33,017 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2021-11-25 18:47:33,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:47:33,027 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 22 [2021-11-25 18:47:33,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:33,028 INFO L225 Difference]: With dead ends: 38 [2021-11-25 18:47:33,028 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 18:47:33,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=104, Invalid=496, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:47:33,030 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:33,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 63 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:33,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 18:47:33,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2021-11-25 18:47:33,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 18:47:33,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-25 18:47:33,043 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 22 [2021-11-25 18:47:33,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:33,043 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-25 18:47:33,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 3 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 18:47:33,044 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-25 18:47:33,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 18:47:33,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:33,045 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:33,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:33,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:33,246 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:33,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:33,246 INFO L85 PathProgramCache]: Analyzing trace with hash 1239390197, now seen corresponding path program 3 times [2021-11-25 18:47:33,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:33,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219135043] [2021-11-25 18:47:33,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:33,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:33,316 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:47:33,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:33,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219135043] [2021-11-25 18:47:33,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219135043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:33,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962543534] [2021-11-25 18:47:33,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:47:33,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:33,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:33,318 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:33,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:47:33,393 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:47:33,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:33,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 18:47:33,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:33,475 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:47:33,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:47:33,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962543534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:33,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106099214] [2021-11-25 18:47:33,541 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:33,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:33,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:33,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:33,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:33,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:33,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:33,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:33,713 INFO L354 Elim1Store]: treesize reduction 70, result has 35.2 percent of original size [2021-11-25 18:47:33,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 59 [2021-11-25 18:47:33,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:33,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:33,779 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:33,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:35,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:35,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:35,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:35,793 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:47:35,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:47:36,938 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:36,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:37,022 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:37,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:37,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '807#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:37,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:37,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:37,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2021-11-25 18:47:37,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602721137] [2021-11-25 18:47:37,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:37,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:47:37,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:37,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:47:37,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:47:37,667 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 18:47:37,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:37,766 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-11-25 18:47:37,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:47:37,766 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 27 [2021-11-25 18:47:37,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:37,767 INFO L225 Difference]: With dead ends: 26 [2021-11-25 18:47:37,767 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 18:47:37,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:47:37,769 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:37,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 59 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:37,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 18:47:37,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 18:47:37,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 18:47:37,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-11-25 18:47:37,777 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 27 [2021-11-25 18:47:37,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:37,777 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-11-25 18:47:37,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 18:47:37,778 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-11-25 18:47:37,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 18:47:37,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:37,779 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:37,817 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 18:47:38,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:38,007 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:38,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:38,007 INFO L85 PathProgramCache]: Analyzing trace with hash -234104468, now seen corresponding path program 4 times [2021-11-25 18:47:38,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:38,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481210839] [2021-11-25 18:47:38,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:38,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:38,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:38,488 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:47:38,488 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:38,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481210839] [2021-11-25 18:47:38,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481210839] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:38,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412582537] [2021-11-25 18:47:38,489 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:47:38,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:38,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:38,490 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:38,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:47:38,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:38,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 18:47:38,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:38,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:47:38,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:38,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:38,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:38,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 45 [2021-11-25 18:47:38,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:38,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 44 [2021-11-25 18:47:39,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 23 [2021-11-25 18:47:39,133 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:47:39,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:41,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412582537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:41,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833872067] [2021-11-25 18:47:41,459 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:41,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:41,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:41,460 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:41,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:41,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:41,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:41,635 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:41,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:41,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:41,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:41,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:41,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:47:43,236 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:43,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:43,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:43,292 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:47:43,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:47:43,827 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:43,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:43,933 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:43,935 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:44,873 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1048#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:44,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:44,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:47:44,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 23 [2021-11-25 18:47:44,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385821080] [2021-11-25 18:47:44,874 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:44,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:47:44,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:44,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:47:44,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1531, Unknown=1, NotChecked=0, Total=1722 [2021-11-25 18:47:44,877 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:47:45,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:45,268 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-11-25 18:47:45,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:47:45,269 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 28 [2021-11-25 18:47:45,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:45,270 INFO L225 Difference]: With dead ends: 32 [2021-11-25 18:47:45,270 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 18:47:45,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=261, Invalid=1994, Unknown=1, NotChecked=0, Total=2256 [2021-11-25 18:47:45,272 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:45,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 54 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 166 Invalid, 0 Unknown, 21 Unchecked, 0.2s Time] [2021-11-25 18:47:45,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 18:47:45,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2021-11-25 18:47:45,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-25 18:47:45,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2021-11-25 18:47:45,279 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 28 [2021-11-25 18:47:45,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:45,280 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2021-11-25 18:47:45,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:47:45,280 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2021-11-25 18:47:45,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 18:47:45,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:45,281 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:45,318 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 18:47:45,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:47:45,495 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:45,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:45,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1332201173, now seen corresponding path program 5 times [2021-11-25 18:47:45,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:45,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638070919] [2021-11-25 18:47:45,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:45,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:45,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:45,576 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:47:45,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:45,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638070919] [2021-11-25 18:47:45,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638070919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:45,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326431968] [2021-11-25 18:47:45,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:47:45,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:45,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:45,590 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:45,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:47:45,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:47:45,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:45,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:47:45,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:47:45,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:45,771 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-25 18:47:45,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326431968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:45,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [955890594] [2021-11-25 18:47:45,773 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:45,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:45,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:45,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:45,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:45,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:45,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:45,948 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:45,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:45,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:45,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:45,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:45,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:47:47,612 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:47,615 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:47,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:47,681 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:47:47,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:47:48,160 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:48,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:48,233 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:48,236 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:48,892 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1346#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:48,892 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:48,892 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:48,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 14 [2021-11-25 18:47:48,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881272812] [2021-11-25 18:47:48,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:48,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:47:48,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:48,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:47:48,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=541, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:47:48,894 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 18:47:49,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:49,023 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2021-11-25 18:47:49,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:47:49,024 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 29 [2021-11-25 18:47:49,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:49,027 INFO L225 Difference]: With dead ends: 46 [2021-11-25 18:47:49,027 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 18:47:49,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=674, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:47:49,029 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 16 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:49,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 67 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:49,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 18:47:49,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2021-11-25 18:47:49,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 18:47:49,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-11-25 18:47:49,045 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 29 [2021-11-25 18:47:49,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:49,045 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-11-25 18:47:49,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 18:47:49,046 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-11-25 18:47:49,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:47:49,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:49,048 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:49,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:49,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:49,271 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:49,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:49,271 INFO L85 PathProgramCache]: Analyzing trace with hash -1861489079, now seen corresponding path program 6 times [2021-11-25 18:47:49,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:49,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004219334] [2021-11-25 18:47:49,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:49,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:49,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 18:47:49,380 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:49,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004219334] [2021-11-25 18:47:49,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004219334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:49,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555964116] [2021-11-25 18:47:49,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:47:49,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:49,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:49,382 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:49,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:47:49,447 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:47:49,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:47:49,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:47:49,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:49,546 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:47:49,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:49,630 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:47:49,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555964116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:49,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064852812] [2021-11-25 18:47:49,637 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:49,638 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:49,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:49,638 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:49,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:49,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:49,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:49,800 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:49,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:49,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:49,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:49,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:49,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:47:51,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:51,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:51,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:51,348 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:47:51,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:47:52,553 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:52,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:52,621 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:52,623 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:47:53,238 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1695#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:47:53,238 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:47:53,238 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:47:53,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-25 18:47:53,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209751335] [2021-11-25 18:47:53,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:47:53,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:47:53,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:53,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:47:53,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:47:53,240 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:47:53,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:53,383 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-11-25 18:47:53,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:47:53,383 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 34 [2021-11-25 18:47:53,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:53,384 INFO L225 Difference]: With dead ends: 31 [2021-11-25 18:47:53,384 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 18:47:53,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=143, Invalid=787, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:47:53,385 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:53,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 49 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:53,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 18:47:53,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 18:47:53,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 18:47:53,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-11-25 18:47:53,391 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 34 [2021-11-25 18:47:53,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:53,392 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-11-25 18:47:53,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:47:53,392 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-11-25 18:47:53,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 18:47:53,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:53,393 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:53,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:53,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:53,603 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:53,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:53,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1872081512, now seen corresponding path program 7 times [2021-11-25 18:47:53,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:53,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950162492] [2021-11-25 18:47:53,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:53,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:53,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:54,176 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:47:54,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:54,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950162492] [2021-11-25 18:47:54,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950162492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:54,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196180326] [2021-11-25 18:47:54,177 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:47:54,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:54,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:54,179 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:54,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:47:54,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:54,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 18:47:54,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:54,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:47:54,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,652 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:54,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 57 [2021-11-25 18:47:54,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 61 [2021-11-25 18:47:54,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:54,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 83 [2021-11-25 18:47:55,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 47 [2021-11-25 18:47:55,201 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 18:47:55,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:56,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196180326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:56,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145892441] [2021-11-25 18:47:56,371 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:47:56,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:56,372 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:56,372 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:56,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:56,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,522 INFO L354 Elim1Store]: treesize reduction 70, result has 35.2 percent of original size [2021-11-25 18:47:56,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 59 [2021-11-25 18:47:56,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:56,595 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:47:56,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:47:58,398 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:58,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:47:58,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,456 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:47:58,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:47:59,808 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:47:59,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:47:59,874 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:47:59,875 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:00,927 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1993#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:00,927 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:00,927 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:48:00,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2021-11-25 18:48:00,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795533350] [2021-11-25 18:48:00,928 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:00,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 18:48:00,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:00,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 18:48:00,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=2215, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 18:48:00,930 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 18:48:01,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:01,598 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2021-11-25 18:48:01,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:48:01,599 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 35 [2021-11-25 18:48:01,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:01,600 INFO L225 Difference]: With dead ends: 38 [2021-11-25 18:48:01,600 INFO L226 Difference]: Without dead ends: 35 [2021-11-25 18:48:01,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=334, Invalid=2972, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 18:48:01,602 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 13 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:01,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 113 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 294 Invalid, 0 Unknown, 49 Unchecked, 0.2s Time] [2021-11-25 18:48:01,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-25 18:48:01,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-11-25 18:48:01,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-25 18:48:01,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-11-25 18:48:01,609 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 35 [2021-11-25 18:48:01,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:01,610 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-11-25 18:48:01,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 18:48:01,610 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-11-25 18:48:01,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 18:48:01,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:01,612 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:01,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:01,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 18:48:01,819 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:01,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:01,819 INFO L85 PathProgramCache]: Analyzing trace with hash 2094520361, now seen corresponding path program 8 times [2021-11-25 18:48:01,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:01,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472473274] [2021-11-25 18:48:01,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:01,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:01,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:01,928 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 18:48:01,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:01,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472473274] [2021-11-25 18:48:01,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472473274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:01,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130135683] [2021-11-25 18:48:01,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:01,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:01,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:01,931 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:01,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:48:02,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:48:02,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:02,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:48:02,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:02,123 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:48:02,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:02,194 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 18:48:02,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130135683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:02,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969529906] [2021-11-25 18:48:02,196 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:48:02,196 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:02,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:02,197 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:02,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:02,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,330 INFO L354 Elim1Store]: treesize reduction 70, result has 35.2 percent of original size [2021-11-25 18:48:02,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 59 [2021-11-25 18:48:02,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,408 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:48:02,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:48:04,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:04,254 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:04,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:04,324 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:48:04,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:48:04,513 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:48:04,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:48:04,599 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:48:04,601 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:05,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2360#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:05,329 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:05,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:05,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 17 [2021-11-25 18:48:05,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19048662] [2021-11-25 18:48:05,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:05,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:48:05,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:05,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:48:05,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=678, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:48:05,330 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:48:05,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:05,468 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2021-11-25 18:48:05,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:48:05,468 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 36 [2021-11-25 18:48:05,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:05,469 INFO L225 Difference]: With dead ends: 54 [2021-11-25 18:48:05,469 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 18:48:05,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 18:48:05,471 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 13 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:05,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 74 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:05,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 18:48:05,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2021-11-25 18:48:05,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 18:48:05,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2021-11-25 18:48:05,478 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 36 [2021-11-25 18:48:05,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:05,479 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2021-11-25 18:48:05,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 4 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 18:48:05,479 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2021-11-25 18:48:05,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 18:48:05,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:05,480 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:05,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:05,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:48:05,687 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:05,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:05,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1854278795, now seen corresponding path program 9 times [2021-11-25 18:48:05,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:05,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830811098] [2021-11-25 18:48:05,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:05,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:05,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:05,776 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 5 proven. 23 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:48:05,777 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:05,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830811098] [2021-11-25 18:48:05,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830811098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:05,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208194843] [2021-11-25 18:48:05,777 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:05,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:05,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:05,779 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:05,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:48:05,847 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:05,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:05,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 18:48:05,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:05,959 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:48:05,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:06,050 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:48:06,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208194843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:06,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224529381] [2021-11-25 18:48:06,053 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:48:06,053 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:06,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:06,053 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:06,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:06,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,210 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:48:06,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:48:06,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:06,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:48:07,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:07,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:07,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:07,871 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:48:07,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:48:08,792 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:48:08,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:48:08,866 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:48:08,874 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:09,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2780#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:09,497 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:09,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:09,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-25 18:48:09,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805388928] [2021-11-25 18:48:09,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:09,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 18:48:09,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:09,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 18:48:09,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=638, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:48:09,499 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:48:09,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:09,691 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-11-25 18:48:09,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 18:48:09,691 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 41 [2021-11-25 18:48:09,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:09,692 INFO L225 Difference]: With dead ends: 36 [2021-11-25 18:48:09,692 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 18:48:09,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=191, Invalid=1069, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 18:48:09,694 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 15 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:09,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 76 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:09,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 18:48:09,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-25 18:48:09,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 18:48:09,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-11-25 18:48:09,703 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 41 [2021-11-25 18:48:09,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:09,703 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-11-25 18:48:09,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:48:09,704 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-11-25 18:48:09,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 18:48:09,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:09,705 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:09,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:09,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:09,927 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:09,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:09,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1648562708, now seen corresponding path program 10 times [2021-11-25 18:48:09,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:09,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277301232] [2021-11-25 18:48:09,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:09,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:10,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:11,186 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 2 proven. 45 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:48:11,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:11,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277301232] [2021-11-25 18:48:11,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277301232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:11,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031669977] [2021-11-25 18:48:11,187 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:11,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:11,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:11,187 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:11,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:48:11,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:11,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 18:48:11,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:11,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:48:11,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:11,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 69 [2021-11-25 18:48:11,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,945 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:11,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 8 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 93 treesize of output 89 [2021-11-25 18:48:12,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 87 [2021-11-25 18:48:12,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 13 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 243 treesize of output 132 [2021-11-25 18:48:12,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 7 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 257 treesize of output 81 [2021-11-25 18:48:13,120 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:48:13,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:27,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031669977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:27,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301681710] [2021-11-25 18:48:27,270 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:48:27,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:27,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:27,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:27,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:27,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:27,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:27,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:27,431 INFO L354 Elim1Store]: treesize reduction 70, result has 35.2 percent of original size [2021-11-25 18:48:27,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 59 [2021-11-25 18:48:27,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:27,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:27,495 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:48:27,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:48:28,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:28,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:28,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:28,944 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:48:28,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:48:30,914 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:48:30,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:48:30,994 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:48:30,996 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:32,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3137#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:32,421 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:32,421 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:48:32,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2021-11-25 18:48:32,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965543895] [2021-11-25 18:48:32,421 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:32,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 18:48:32,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:32,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 18:48:32,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=3270, Unknown=3, NotChecked=0, Total=3540 [2021-11-25 18:48:32,424 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 37 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 37 states have internal predecessors, (48), 11 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 18:48:34,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:34,216 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-11-25 18:48:34,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:48:34,217 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 37 states have internal predecessors, (48), 11 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 42 [2021-11-25 18:48:34,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:34,218 INFO L225 Difference]: With dead ends: 44 [2021-11-25 18:48:34,218 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 18:48:34,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1475 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=460, Invalid=5087, Unknown=3, NotChecked=0, Total=5550 [2021-11-25 18:48:34,221 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:34,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 77 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 490 Invalid, 0 Unknown, 29 Unchecked, 0.4s Time] [2021-11-25 18:48:34,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 18:48:34,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2021-11-25 18:48:34,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 18:48:34,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2021-11-25 18:48:34,231 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 42 [2021-11-25 18:48:34,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:34,231 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2021-11-25 18:48:34,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 37 states have internal predecessors, (48), 11 states have call successors, (11), 1 states have call predecessors, (11), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 18:48:34,232 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2021-11-25 18:48:34,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 18:48:34,233 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:34,233 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:34,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:34,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:34,447 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:34,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:34,447 INFO L85 PathProgramCache]: Analyzing trace with hash 433668693, now seen corresponding path program 11 times [2021-11-25 18:48:34,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:34,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69131728] [2021-11-25 18:48:34,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:34,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:34,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:34,575 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 11 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:48:34,575 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:34,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69131728] [2021-11-25 18:48:34,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69131728] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:34,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058018062] [2021-11-25 18:48:34,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:34,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:34,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:34,577 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:34,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:48:34,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:48:34,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:34,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:48:34,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:34,835 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:48:34,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:34,922 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 18:48:34,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058018062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:34,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [492696537] [2021-11-25 18:48:34,923 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:48:34,923 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:34,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:34,924 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:34,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:35,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,071 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:48:35,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:48:35,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:35,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:48:36,992 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:36,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:36,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:37,089 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:48:37,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:48:37,352 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:48:37,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:48:37,431 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:48:37,433 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:38,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3583#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:38,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:38,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:38,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 20 [2021-11-25 18:48:38,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611028309] [2021-11-25 18:48:38,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:38,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:48:38,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:38,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:48:38,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=829, Unknown=0, NotChecked=0, Total=992 [2021-11-25 18:48:38,283 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:48:38,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:38,480 INFO L93 Difference]: Finished difference Result 62 states and 75 transitions. [2021-11-25 18:48:38,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:48:38,481 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 43 [2021-11-25 18:48:38,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:38,482 INFO L225 Difference]: With dead ends: 62 [2021-11-25 18:48:38,482 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 18:48:38,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=227, Invalid=1105, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:48:38,484 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:38,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 73 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:38,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 18:48:38,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2021-11-25 18:48:38,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:48:38,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2021-11-25 18:48:38,493 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 43 [2021-11-25 18:48:38,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:38,494 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2021-11-25 18:48:38,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 5 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:48:38,495 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2021-11-25 18:48:38,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 18:48:38,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:38,496 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:38,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:38,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:48:38,711 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:38,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:38,711 INFO L85 PathProgramCache]: Analyzing trace with hash 127792201, now seen corresponding path program 12 times [2021-11-25 18:48:38,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:38,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803551202] [2021-11-25 18:48:38,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:38,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:38,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:38,850 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 18:48:38,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:38,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803551202] [2021-11-25 18:48:38,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803551202] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:38,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26274427] [2021-11-25 18:48:38,850 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:38,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:38,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:38,852 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:38,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:48:38,930 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:38,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:38,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:48:38,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:39,097 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 18:48:39,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:39,202 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 18:48:39,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26274427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:39,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1177850227] [2021-11-25 18:48:39,204 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:48:39,204 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:39,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:39,205 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:39,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:39,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,373 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:48:39,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:48:39,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:39,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:48:40,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:40,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:40,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:40,759 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:48:40,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:48:41,186 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:48:41,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:48:41,262 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:48:41,264 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:41,982 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4074#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:48:41,982 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:41,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:41,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-25 18:48:41,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619013063] [2021-11-25 18:48:41,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:41,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:48:41,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:41,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:48:41,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2021-11-25 18:48:41,984 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 18:48:42,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:42,223 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-11-25 18:48:42,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 18:48:42,224 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 48 [2021-11-25 18:48:42,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:42,224 INFO L225 Difference]: With dead ends: 41 [2021-11-25 18:48:42,224 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 18:48:42,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=249, Invalid=1391, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:48:42,226 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 12 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:42,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 93 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:42,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 18:48:42,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-25 18:48:42,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:48:42,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2021-11-25 18:48:42,236 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 48 [2021-11-25 18:48:42,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:42,236 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2021-11-25 18:48:42,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 18:48:42,237 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2021-11-25 18:48:42,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:48:42,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:42,238 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:42,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:42,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:48:42,454 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:42,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:42,454 INFO L85 PathProgramCache]: Analyzing trace with hash -333903976, now seen corresponding path program 13 times [2021-11-25 18:48:42,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:42,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543530360] [2021-11-25 18:48:42,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:42,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:42,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:58,601 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 18:48:58,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:58,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543530360] [2021-11-25 18:48:58,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543530360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:58,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226990706] [2021-11-25 18:48:58,602 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:58,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:58,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:58,603 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:58,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:48:58,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:58,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 18:48:58,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:58,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 18:48:59,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,644 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:59,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 81 [2021-11-25 18:48:59,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:59,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 101 [2021-11-25 18:48:59,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,919 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:59,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:59,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 121 [2021-11-25 18:49:00,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,081 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:00,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 17 disjoint index pairs (out of 36 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 141 [2021-11-25 18:49:00,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:00,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 21 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 396 treesize of output 191 [2021-11-25 18:49:01,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 11 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 405 treesize of output 125 [2021-11-25 18:49:02,166 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 18:49:02,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:28,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226990706] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:28,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [293370742] [2021-11-25 18:49:28,996 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:49:28,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:28,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:28,997 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:28,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:29,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:29,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:29,137 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:49:29,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:49:29,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:29,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:29,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:29,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:49:30,359 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:30,361 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:30,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:30,443 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:49:30,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:49:31,623 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:49:31,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:49:31,690 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:49:31,692 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:33,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4488#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:49:33,628 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:33,628 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:49:33,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 43 [2021-11-25 18:49:33,629 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172727760] [2021-11-25 18:49:33,630 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:33,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 18:49:33,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:33,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 18:49:33,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=4223, Unknown=6, NotChecked=0, Total=4556 [2021-11-25 18:49:33,632 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 13 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 18:49:36,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:36,236 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2021-11-25 18:49:36,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 18:49:36,236 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 13 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 49 [2021-11-25 18:49:36,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:36,237 INFO L225 Difference]: With dead ends: 50 [2021-11-25 18:49:36,237 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 18:49:36,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2076 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=568, Invalid=6736, Unknown=6, NotChecked=0, Total=7310 [2021-11-25 18:49:36,240 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 712 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:36,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 193 Invalid, 807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 712 Invalid, 0 Unknown, 41 Unchecked, 0.6s Time] [2021-11-25 18:49:36,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 18:49:36,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2021-11-25 18:49:36,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 18:49:36,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2021-11-25 18:49:36,253 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 49 [2021-11-25 18:49:36,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:36,254 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2021-11-25 18:49:36,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 13 states have call successors, (13), 1 states have call predecessors, (13), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-25 18:49:36,254 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2021-11-25 18:49:36,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:49:36,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:36,256 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:36,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:36,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:36,475 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:36,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:36,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1761583575, now seen corresponding path program 14 times [2021-11-25 18:49:36,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:36,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49286223] [2021-11-25 18:49:36,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:36,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:36,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:36,616 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 40 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 18:49:36,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:36,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49286223] [2021-11-25 18:49:36,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49286223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:36,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466547465] [2021-11-25 18:49:36,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:49:36,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:36,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:36,631 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:36,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:49:36,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:49:36,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:36,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:49:36,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:36,876 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 18:49:36,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:36,957 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 18:49:36,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466547465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:36,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1437788229] [2021-11-25 18:49:36,958 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:49:36,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:36,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:36,959 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:36,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:37,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:37,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:37,100 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:49:37,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:49:37,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:37,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:37,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:37,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:49:38,875 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:38,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:38,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:38,965 INFO L354 Elim1Store]: treesize reduction 101, result has 41.6 percent of original size [2021-11-25 18:49:38,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 254 treesize of output 302 [2021-11-25 18:49:39,696 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:49:39,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:49:39,785 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:49:39,786 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:40,563 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5005#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:49:40,563 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:40,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:40,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2021-11-25 18:49:40,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229052686] [2021-11-25 18:49:40,564 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:40,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:49:40,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:40,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:49:40,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=994, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 18:49:40,565 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 18:49:40,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:40,760 INFO L93 Difference]: Finished difference Result 70 states and 84 transitions. [2021-11-25 18:49:40,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 18:49:40,761 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 50 [2021-11-25 18:49:40,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:40,761 INFO L225 Difference]: With dead ends: 70 [2021-11-25 18:49:40,761 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 18:49:40,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=282, Invalid=1358, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 18:49:40,763 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 16 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:40,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 97 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:49:40,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 18:49:40,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-11-25 18:49:40,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 18:49:40,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2021-11-25 18:49:40,773 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 50 [2021-11-25 18:49:40,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:40,774 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2021-11-25 18:49:40,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 6 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 18:49:40,774 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2021-11-25 18:49:40,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 18:49:40,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:40,775 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:40,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:40,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:49:40,979 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:40,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:40,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1401605877, now seen corresponding path program 15 times [2021-11-25 18:49:40,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:40,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216483227] [2021-11-25 18:49:40,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:40,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:41,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:41,145 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 22 proven. 44 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-25 18:49:41,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:41,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216483227] [2021-11-25 18:49:41,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216483227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:41,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283605349] [2021-11-25 18:49:41,145 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:49:41,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:41,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:41,146 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:41,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:49:41,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:49:41,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:49:41,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 18:49:41,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:41,387 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-25 18:49:41,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:41,485 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-25 18:49:41,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283605349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:41,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404555232] [2021-11-25 18:49:41,486 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:49:41,486 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:41,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:41,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:41,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:41,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:41,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:41,633 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 18:49:41,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 18:49:41,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:41,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:41,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:41,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 13 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 41 [2021-11-25 18:49:42,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:43,000 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:49:43,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:49:43,065 INFO L354 Elim1Store]: treesize reduction 85, result has 42.6 percent of original size [2021-11-25 18:49:43,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 236 treesize of output 280 [2021-11-25 18:49:44,075 INFO L354 Elim1Store]: treesize reduction 46, result has 30.3 percent of original size [2021-11-25 18:49:44,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 37 [2021-11-25 18:49:44,159 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 8 for LOIs [2021-11-25 18:49:44,160 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:44,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5567#(and (<= |ULTIMATE.start_main_~N~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)))' at error location [2021-11-25 18:49:44,878 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:44,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:44,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-25 18:49:44,879 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240749386] [2021-11-25 18:49:44,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:44,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 18:49:44,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:44,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 18:49:44,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=948, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 18:49:44,880 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 18:49:45,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:45,195 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2021-11-25 18:49:45,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 18:49:45,195 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 55 [2021-11-25 18:49:45,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:45,196 INFO L225 Difference]: With dead ends: 46 [2021-11-25 18:49:45,196 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 18:49:45,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=317, Invalid=1753, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 18:49:45,198 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:45,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 113 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:49:45,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 18:49:45,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-25 18:49:45,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 8 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 18:49:45,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2021-11-25 18:49:45,210 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 55 [2021-11-25 18:49:45,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:45,210 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2021-11-25 18:49:45,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 7 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 18:49:45,211 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2021-11-25 18:49:45,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 18:49:45,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:45,212 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:45,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:45,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00c5b1d8-0a2f-4046-a531-6b75d96cc755/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:49:45,431 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:45,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:45,431 INFO L85 PathProgramCache]: Analyzing trace with hash 499614316, now seen corresponding path program 16 times [2021-11-25 18:49:45,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:45,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128782745] [2021-11-25 18:49:45,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:45,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:45,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat