./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:13:27,727 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:13:27,730 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:13:27,784 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:13:27,785 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:13:27,790 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:13:27,792 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:13:27,796 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:13:27,799 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:13:27,807 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:13:27,808 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:13:27,810 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:13:27,811 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:13:27,813 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:13:27,816 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:13:27,822 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:13:27,825 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:13:27,826 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:13:27,829 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:13:27,837 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:13:27,839 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:13:27,840 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:13:27,844 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:13:27,845 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:13:27,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:13:27,855 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:13:27,855 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:13:27,857 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:13:27,858 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:13:27,859 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:13:27,860 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:13:27,861 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:13:27,863 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:13:27,868 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:13:27,870 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:13:27,871 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:13:27,871 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:13:27,872 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:13:27,872 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:13:27,873 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:13:27,874 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:13:27,875 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:13:27,920 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:13:27,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:13:27,921 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:13:27,921 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:13:27,923 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:13:27,923 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:13:27,923 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:13:27,923 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:13:27,924 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:13:27,924 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:13:27,925 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:13:27,925 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:13:27,926 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:13:27,926 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:13:27,926 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:13:27,927 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:13:27,927 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:13:27,927 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:13:27,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:13:27,928 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:13:27,928 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:13:27,929 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:13:27,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:13:27,929 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:13:27,929 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:13:27,930 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:13:27,930 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:13:27,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:13:27,931 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:13:27,931 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:13:27,931 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:13:27,932 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:13:27,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:13:27,932 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:13:27,932 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:13:27,933 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:13:27,933 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:13:27,933 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:13:27,933 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:13:27,934 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:13:27,934 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:13:27,934 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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2021-11-25 20:13:28,178 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:13:28,208 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:13:28,211 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:13:28,211 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:13:28,212 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:13:28,213 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-25 20:13:28,289 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/data/ff6152062/48cc1a880ff247ac833496ffad1967e6/FLAGc64ff6d7d [2021-11-25 20:13:28,826 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:13:28,827 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-25 20:13:28,838 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/data/ff6152062/48cc1a880ff247ac833496ffad1967e6/FLAGc64ff6d7d [2021-11-25 20:13:29,215 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/data/ff6152062/48cc1a880ff247ac833496ffad1967e6 [2021-11-25 20:13:29,217 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:13:29,220 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:13:29,222 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:29,222 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:13:29,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:13:29,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,227 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17fbf790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29, skipping insertion in model container [2021-11-25 20:13:29,228 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,237 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:13:29,254 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:13:29,455 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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-25 20:13:29,467 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:29,474 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:13:29,486 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_b8b1c35c-9ffd-497a-80b3-cb38da80563d/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-25 20:13:29,491 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:29,504 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:13:29,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29 WrapperNode [2021-11-25 20:13:29,505 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:29,506 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:13:29,507 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:13:29,507 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:13:29,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,520 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,538 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-25 20:13:29,539 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:13:29,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:13:29,540 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:13:29,540 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:13:29,548 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,550 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,553 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:13:29,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:13:29,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:13:29,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:13:29,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (1/1) ... [2021-11-25 20:13:29,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:13:29,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:29,593 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:13:29,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:13:29,639 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:13:29,640 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:13:29,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:13:29,640 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:13:29,707 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:13:29,709 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:13:29,897 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:13:29,919 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:13:29,925 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 20:13:29,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:13:29 BoogieIcfgContainer [2021-11-25 20:13:29,928 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:13:29,930 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:13:29,930 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:13:29,933 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:13:29,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:13:29" (1/3) ... [2021-11-25 20:13:29,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7511af6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:13:29, skipping insertion in model container [2021-11-25 20:13:29,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:29" (2/3) ... [2021-11-25 20:13:29,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7511af6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:13:29, skipping insertion in model container [2021-11-25 20:13:29,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:13:29" (3/3) ... [2021-11-25 20:13:29,938 INFO L111 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2021-11-25 20:13:29,943 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:13:29,943 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:13:30,004 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:13:30,017 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 20:13:30,018 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:13:30,043 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:13:30,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:30,052 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:30,053 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:30,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:30,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2021-11-25 20:13:30,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:30,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353414380] [2021-11-25 20:13:30,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:30,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:30,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:30,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:30,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:30,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353414380] [2021-11-25 20:13:30,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353414380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:30,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:30,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:13:30,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830918471] [2021-11-25 20:13:30,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:30,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 20:13:30,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:30,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 20:13:30,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:13:30,272 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:30,314 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-25 20:13:30,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 20:13:30,317 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 20:13:30,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:30,340 INFO L225 Difference]: With dead ends: 27 [2021-11-25 20:13:30,340 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 20:13:30,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:13:30,346 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:30,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:13:30,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 20:13:30,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-25 20:13:30,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-25 20:13:30,394 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2021-11-25 20:13:30,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:30,395 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-25 20:13:30,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,395 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-25 20:13:30,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:13:30,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:30,396 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:30,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:13:30,397 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:30,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:30,398 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2021-11-25 20:13:30,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:30,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838198752] [2021-11-25 20:13:30,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:30,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:30,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:30,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:30,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:30,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838198752] [2021-11-25 20:13:30,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838198752] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:30,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:30,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:13:30,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304937083] [2021-11-25 20:13:30,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:30,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:30,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:30,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:30,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:30,533 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:30,588 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-11-25 20:13:30,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:30,590 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 20:13:30,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:30,591 INFO L225 Difference]: With dead ends: 18 [2021-11-25 20:13:30,591 INFO L226 Difference]: Without dead ends: 16 [2021-11-25 20:13:30,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 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 20:13:30,598 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:30,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 21 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:13:30,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-25 20:13:30,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-25 20:13:30,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-25 20:13:30,611 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2021-11-25 20:13:30,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:30,614 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-25 20:13:30,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,616 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-25 20:13:30,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:13:30,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:30,618 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:30,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:13:30,618 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:30,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:30,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2021-11-25 20:13:30,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:30,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934551020] [2021-11-25 20:13:30,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:30,624 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:30,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:30,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:30,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:30,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934551020] [2021-11-25 20:13:30,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934551020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:30,760 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:30,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:13:30,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839938728] [2021-11-25 20:13:30,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:30,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:13:30,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:30,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:13:30,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:13:30,762 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:30,835 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-25 20:13:30,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:13:30,836 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:13:30,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:30,837 INFO L225 Difference]: With dead ends: 31 [2021-11-25 20:13:30,837 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 20:13:30,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:13:30,847 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:30,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:13:30,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 20:13:30,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-25 20:13:30,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-25 20:13:30,857 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2021-11-25 20:13:30,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:30,858 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-25 20:13:30,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:30,858 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-25 20:13:30,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 20:13:30,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:30,859 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:30,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:13:30,859 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:30,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:30,860 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2021-11-25 20:13:30,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:30,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882610573] [2021-11-25 20:13:30,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:30,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:30,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:30,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:31,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:31,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882610573] [2021-11-25 20:13:31,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882610573] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:31,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741823363] [2021-11-25 20:13:31,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:31,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:31,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:31,004 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:31,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:13:31,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:31,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:13:31,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:31,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:31,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:31,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741823363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:31,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159052865] [2021-11-25 20:13:31,358 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:31,359 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:31,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:31,370 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:31,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:31,805 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:32,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:32,301 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:32,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:32,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2021-11-25 20:13:32,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070482078] [2021-11-25 20:13:32,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:32,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:13:32,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:32,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:13:32,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:13:32,303 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:32,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:32,546 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-25 20:13:32,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:13:32,547 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 20:13:32,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:32,548 INFO L225 Difference]: With dead ends: 41 [2021-11-25 20:13:32,548 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:13:32,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:13:32,552 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:32,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 41 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:32,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:13:32,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2021-11-25 20:13:32,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:32,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-25 20:13:32,558 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-11-25 20:13:32,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:32,558 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-25 20:13:32,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:32,559 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-25 20:13:32,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:13:32,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:32,560 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:32,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:32,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:32,779 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:32,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:32,780 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2021-11-25 20:13:32,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:32,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80768950] [2021-11-25 20:13:32,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:32,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:32,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:32,873 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:32,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:32,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80768950] [2021-11-25 20:13:32,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80768950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:32,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286167189] [2021-11-25 20:13:32,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:32,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:32,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:32,875 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:32,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:13:32,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:13:32,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:32,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:13:32,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:33,070 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:33,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:33,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286167189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:33,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [845064740] [2021-11-25 20:13:33,162 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:33,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:33,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:33,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:33,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:33,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:33,814 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:33,814 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:33,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:33,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 16 [2021-11-25 20:13:33,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796390615] [2021-11-25 20:13:33,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:33,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:13:33,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:33,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:13:33,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:13:33,816 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:34,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:34,073 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-11-25 20:13:34,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:13:34,073 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 20:13:34,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:34,076 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:13:34,076 INFO L226 Difference]: Without dead ends: 39 [2021-11-25 20:13:34,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:13:34,078 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 52 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:34,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 62 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:34,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-25 20:13:34,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2021-11-25 20:13:34,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:34,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-25 20:13:34,085 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2021-11-25 20:13:34,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:34,086 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-25 20:13:34,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:34,086 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-25 20:13:34,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:13:34,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:34,087 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:34,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:34,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:34,300 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:34,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:34,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1367196232, now seen corresponding path program 3 times [2021-11-25 20:13:34,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:34,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695761793] [2021-11-25 20:13:34,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:34,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:34,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:34,423 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:34,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:34,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695761793] [2021-11-25 20:13:34,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695761793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:34,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977202954] [2021-11-25 20:13:34,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:13:34,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:34,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:34,425 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:34,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:13:34,470 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:13:34,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:34,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:13:34,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:34,597 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:34,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:34,672 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:34,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977202954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:34,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024733306] [2021-11-25 20:13:34,675 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:34,675 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:34,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:34,676 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:34,676 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:34,879 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:35,245 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '885#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:35,245 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:35,245 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:35,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 15 [2021-11-25 20:13:35,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911886434] [2021-11-25 20:13:35,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:35,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 20:13:35,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:35,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 20:13:35,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:13:35,247 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:35,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:35,564 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-11-25 20:13:35,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:13:35,567 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-25 20:13:35,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:35,568 INFO L225 Difference]: With dead ends: 69 [2021-11-25 20:13:35,569 INFO L226 Difference]: Without dead ends: 50 [2021-11-25 20:13:35,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:13:35,571 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 58 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:35,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 52 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:35,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-25 20:13:35,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2021-11-25 20:13:35,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:35,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-11-25 20:13:35,582 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-11-25 20:13:35,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:35,583 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-11-25 20:13:35,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:35,583 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-11-25 20:13:35,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 20:13:35,585 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:35,585 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:35,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:35,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:35,809 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:35,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:35,810 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 4 times [2021-11-25 20:13:35,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:35,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901985308] [2021-11-25 20:13:35,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:35,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:35,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:36,003 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:36,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:36,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901985308] [2021-11-25 20:13:36,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901985308] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:36,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599283648] [2021-11-25 20:13:36,004 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:13:36,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:36,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:36,009 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:36,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:13:36,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:36,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:13:36,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:36,247 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:36,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:36,346 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:36,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599283648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:36,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443866694] [2021-11-25 20:13:36,349 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:36,349 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:36,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:36,349 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:36,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:36,558 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:36,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1295#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:36,939 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:36,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:36,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-25 20:13:36,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332309644] [2021-11-25 20:13:36,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:36,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:13:36,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:36,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:13:36,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:13:36,942 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:37,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:37,088 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-11-25 20:13:37,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:13:37,089 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 20:13:37,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:37,090 INFO L225 Difference]: With dead ends: 75 [2021-11-25 20:13:37,090 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:13:37,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:13:37,092 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:37,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 94 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:37,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:13:37,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2021-11-25 20:13:37,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:37,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-25 20:13:37,098 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2021-11-25 20:13:37,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:37,099 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-25 20:13:37,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:37,099 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-25 20:13:37,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:13:37,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:37,102 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:37,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:37,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:37,329 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:37,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:37,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 5 times [2021-11-25 20:13:37,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:37,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394601602] [2021-11-25 20:13:37,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:37,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:37,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:37,448 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:37,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:37,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394601602] [2021-11-25 20:13:37,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394601602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:37,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080158005] [2021-11-25 20:13:37,449 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:37,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:37,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:37,450 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:37,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:13:37,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:13:37,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:37,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:13:37,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:37,600 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:37,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:37,691 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:37,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080158005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:37,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1194808618] [2021-11-25 20:13:37,694 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:37,694 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:37,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:37,694 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:37,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:37,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:38,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1695#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:38,168 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:38,168 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:38,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2021-11-25 20:13:38,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356871727] [2021-11-25 20:13:38,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:38,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:13:38,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:38,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:13:38,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:13:38,170 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:38,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:38,295 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-11-25 20:13:38,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:13:38,295 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-25 20:13:38,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:38,296 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:13:38,296 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:13:38,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:13:38,297 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:38,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 73 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:38,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:13:38,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2021-11-25 20:13:38,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:38,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-11-25 20:13:38,307 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2021-11-25 20:13:38,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:38,307 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-11-25 20:13:38,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:38,308 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-11-25 20:13:38,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 20:13:38,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:38,309 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:38,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:38,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:38,531 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:38,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:38,532 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 6 times [2021-11-25 20:13:38,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:38,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880309395] [2021-11-25 20:13:38,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:38,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:38,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:38,710 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:38,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:38,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880309395] [2021-11-25 20:13:38,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880309395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:38,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108512552] [2021-11-25 20:13:38,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:13:38,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:38,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:38,712 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:38,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:13:38,768 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:13:38,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:38,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:13:38,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:39,043 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:39,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:39,180 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:39,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108512552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:39,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [252173770] [2021-11-25 20:13:39,182 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:39,183 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:39,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:39,183 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:39,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:39,360 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:39,706 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2146#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:39,706 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:39,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:39,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-11-25 20:13:39,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650748309] [2021-11-25 20:13:39,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:39,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:13:39,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:39,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:13:39,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:13:39,709 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:40,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:40,007 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2021-11-25 20:13:40,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:13:40,008 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 20:13:40,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:40,008 INFO L225 Difference]: With dead ends: 124 [2021-11-25 20:13:40,008 INFO L226 Difference]: Without dead ends: 70 [2021-11-25 20:13:40,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=422, Invalid=1834, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:13:40,011 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 70 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:40,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 146 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:40,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-25 20:13:40,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2021-11-25 20:13:40,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:40,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-11-25 20:13:40,019 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-11-25 20:13:40,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:40,019 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-11-25 20:13:40,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:40,019 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-11-25 20:13:40,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 20:13:40,021 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:40,021 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:40,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:40,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:40,234 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:40,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:40,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 7 times [2021-11-25 20:13:40,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:40,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188587681] [2021-11-25 20:13:40,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:40,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:40,337 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:40,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188587681] [2021-11-25 20:13:40,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188587681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:40,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021487703] [2021-11-25 20:13:40,338 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:13:40,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:40,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:40,346 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:40,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:13:40,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:40,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:13:40,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:40,496 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:40,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:40,600 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:40,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021487703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:40,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1762663027] [2021-11-25 20:13:40,603 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:40,603 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:40,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:40,603 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:40,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:40,767 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:41,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2726#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:41,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:41,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:41,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2021-11-25 20:13:41,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297896972] [2021-11-25 20:13:41,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:41,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:13:41,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:41,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:13:41,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:13:41,071 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:41,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:41,225 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-11-25 20:13:41,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:13:41,226 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-25 20:13:41,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:41,227 INFO L225 Difference]: With dead ends: 66 [2021-11-25 20:13:41,227 INFO L226 Difference]: Without dead ends: 64 [2021-11-25 20:13:41,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=814, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:13:41,230 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:41,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 93 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:41,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-25 20:13:41,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2021-11-25 20:13:41,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:41,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-11-25 20:13:41,237 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2021-11-25 20:13:41,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:41,238 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-11-25 20:13:41,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:41,238 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-11-25 20:13:41,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 20:13:41,239 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:41,239 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:41,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:41,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:13:41,465 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:41,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:41,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 8 times [2021-11-25 20:13:41,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:41,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830354235] [2021-11-25 20:13:41,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:41,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:41,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:41,641 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:41,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:41,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830354235] [2021-11-25 20:13:41,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1830354235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:41,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354811550] [2021-11-25 20:13:41,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:41,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:41,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:41,643 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:41,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:13:41,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-25 20:13:41,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:41,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:13:41,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:42,074 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:42,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:42,240 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:42,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354811550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:42,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322750119] [2021-11-25 20:13:42,242 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:42,242 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:42,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:42,243 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:42,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:42,440 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:42,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3295#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:42,771 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:42,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:42,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2021-11-25 20:13:42,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109566268] [2021-11-25 20:13:42,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:42,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:13:42,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:42,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:13:42,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1350, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:13:42,774 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:43,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:43,140 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-11-25 20:13:43,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:13:43,141 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 20:13:43,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:43,142 INFO L225 Difference]: With dead ends: 158 [2021-11-25 20:13:43,142 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 20:13:43,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 20:13:43,144 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 96 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:43,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 171 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:13:43,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 20:13:43,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2021-11-25 20:13:43,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:43,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-25 20:13:43,161 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-11-25 20:13:43,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:43,162 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-25 20:13:43,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:43,162 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-25 20:13:43,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:13:43,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:43,167 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:43,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:43,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:43,389 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:43,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:43,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 9 times [2021-11-25 20:13:43,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:43,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632769059] [2021-11-25 20:13:43,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:43,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:43,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:43,524 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:43,524 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:43,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632769059] [2021-11-25 20:13:43,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632769059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:43,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533644152] [2021-11-25 20:13:43,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:13:43,524 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:43,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:43,529 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:43,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:13:43,590 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:13:43,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:43,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:13:43,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:43,714 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:43,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:43,854 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:43,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533644152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:43,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1965692139] [2021-11-25 20:13:43,856 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:43,856 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:43,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:43,857 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:43,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:44,040 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:44,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4025#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:44,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:44,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:44,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2021-11-25 20:13:44,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950360422] [2021-11-25 20:13:44,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:44,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:13:44,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:44,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:13:44,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:13:44,362 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:44,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:44,537 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-11-25 20:13:44,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:13:44,538 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-25 20:13:44,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:44,539 INFO L225 Difference]: With dead ends: 78 [2021-11-25 20:13:44,539 INFO L226 Difference]: Without dead ends: 76 [2021-11-25 20:13:44,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=315, Invalid=1017, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:13:44,540 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 69 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 97 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 20:13:44,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 97 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:44,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-25 20:13:44,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2021-11-25 20:13:44,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:44,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-11-25 20:13:44,548 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2021-11-25 20:13:44,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:44,548 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-11-25 20:13:44,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:44,549 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-11-25 20:13:44,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 20:13:44,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:44,550 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:44,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:44,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:13:44,773 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:44,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:44,773 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 10 times [2021-11-25 20:13:44,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:44,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297155991] [2021-11-25 20:13:44,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:44,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:44,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:45,026 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:45,027 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:45,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297155991] [2021-11-25 20:13:45,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297155991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:45,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115609092] [2021-11-25 20:13:45,027 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:13:45,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:45,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:45,029 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:45,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:13:45,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:45,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:13:45,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:13:45,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:45,644 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:13:45,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115609092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:45,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873475126] [2021-11-25 20:13:45,646 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:45,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:45,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:45,647 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:45,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:45,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:46,122 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4709#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:46,122 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:46,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:46,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2021-11-25 20:13:46,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316967506] [2021-11-25 20:13:46,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:46,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:13:46,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:46,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:13:46,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:13:46,124 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:46,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:46,410 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2021-11-25 20:13:46,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:13:46,411 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-25 20:13:46,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:46,412 INFO L225 Difference]: With dead ends: 146 [2021-11-25 20:13:46,412 INFO L226 Difference]: Without dead ends: 101 [2021-11-25 20:13:46,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:13:46,414 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:46,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 204 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:46,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-25 20:13:46,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2021-11-25 20:13:46,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:46,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-11-25 20:13:46,427 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2021-11-25 20:13:46,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:46,428 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-11-25 20:13:46,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:46,428 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-11-25 20:13:46,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 20:13:46,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:46,430 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:46,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:46,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:13:46,645 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:46,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:46,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 11 times [2021-11-25 20:13:46,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:46,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636196204] [2021-11-25 20:13:46,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:46,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:46,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:46,900 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:46,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:46,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636196204] [2021-11-25 20:13:46,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636196204] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:46,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449504564] [2021-11-25 20:13:46,901 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:46,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:46,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:46,904 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:46,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:13:46,969 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 20:13:46,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:46,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:13:46,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:47,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:47,465 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:47,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449504564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:47,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29130959] [2021-11-25 20:13:47,468 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:47,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:47,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:47,468 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:47,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:47,644 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:48,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5502#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:48,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:48,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:48,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 36 [2021-11-25 20:13:48,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539384875] [2021-11-25 20:13:48,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:48,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:13:48,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:48,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:13:48,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:13:48,022 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:48,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:48,861 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2021-11-25 20:13:48,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 20:13:48,862 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 20:13:48,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:48,862 INFO L225 Difference]: With dead ends: 160 [2021-11-25 20:13:48,862 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:13:48,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2466 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1184, Invalid=6648, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 20:13:48,865 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 186 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:48,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 148 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:13:48,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:13:48,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2021-11-25 20:13:48,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:48,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-11-25 20:13:48,876 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 70 [2021-11-25 20:13:48,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:48,877 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-11-25 20:13:48,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:48,877 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-11-25 20:13:48,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 20:13:48,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:48,878 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:48,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:49,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:13:49,105 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:49,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:49,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1928614536, now seen corresponding path program 12 times [2021-11-25 20:13:49,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:49,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958506992] [2021-11-25 20:13:49,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:49,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:49,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:49,424 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:49,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:49,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958506992] [2021-11-25 20:13:49,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958506992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:49,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825970178] [2021-11-25 20:13:49,425 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:13:49,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:49,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:49,427 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:49,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:13:49,497 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:13:49,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:49,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:13:49,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:49,852 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:49,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:50,032 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:50,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825970178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:50,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973768191] [2021-11-25 20:13:50,034 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:50,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:50,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:50,035 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:50,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:50,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:50,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6443#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:50,597 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:50,597 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:50,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2021-11-25 20:13:50,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33860751] [2021-11-25 20:13:50,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:50,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 20:13:50,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:50,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 20:13:50,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1937, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:13:50,600 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:51,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:51,577 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2021-11-25 20:13:51,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-25 20:13:51,577 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-25 20:13:51,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:51,578 INFO L225 Difference]: With dead ends: 173 [2021-11-25 20:13:51,578 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 20:13:51,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1378, Invalid=7742, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 20:13:51,582 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 170 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:51,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 177 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:13:51,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 20:13:51,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 83. [2021-11-25 20:13:51,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:51,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-11-25 20:13:51,590 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 76 [2021-11-25 20:13:51,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:51,590 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-11-25 20:13:51,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:51,591 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-11-25 20:13:51,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 20:13:51,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:51,592 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:51,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:51,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:13:51,812 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:51,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:51,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 13 times [2021-11-25 20:13:51,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:51,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664938287] [2021-11-25 20:13:51,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:51,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:51,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:52,142 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:52,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:52,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664938287] [2021-11-25 20:13:52,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664938287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:52,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006569603] [2021-11-25 20:13:52,142 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:13:52,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:52,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:52,143 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:52,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:13:52,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:52,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:13:52,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:52,729 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:52,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:52,910 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:52,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006569603] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:52,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [370835552] [2021-11-25 20:13:52,913 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:52,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:52,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:52,913 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:52,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:53,062 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:53,435 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7461#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:53,435 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:53,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:53,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-25 20:13:53,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573657627] [2021-11-25 20:13:53,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:53,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-25 20:13:53,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:53,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-25 20:13:53,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 20:13:53,438 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:53,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:53,796 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2021-11-25 20:13:53,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:13:53,797 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-25 20:13:53,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:53,798 INFO L225 Difference]: With dead ends: 179 [2021-11-25 20:13:53,798 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 20:13:53,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:13:53,800 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:53,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 251 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:13:53,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 20:13:53,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2021-11-25 20:13:53,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:53,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-25 20:13:53,815 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2021-11-25 20:13:53,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:53,815 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-25 20:13:53,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:53,816 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-25 20:13:53,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-25 20:13:53,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:53,817 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:53,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:54,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:13:54,033 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:54,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:54,033 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 14 times [2021-11-25 20:13:54,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:54,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295796153] [2021-11-25 20:13:54,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:54,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:54,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:54,239 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:54,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:54,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295796153] [2021-11-25 20:13:54,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295796153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:54,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709311520] [2021-11-25 20:13:54,240 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:13:54,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:54,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:54,241 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:54,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:13:54,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-25 20:13:54,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:54,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:13:54,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:54,526 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:54,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:54,691 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:54,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709311520] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:54,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [585740137] [2021-11-25 20:13:54,693 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:54,693 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:54,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:54,693 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:54,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:54,887 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:55,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8397#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:55,180 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:55,180 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:55,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2021-11-25 20:13:55,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130753257] [2021-11-25 20:13:55,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:55,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:13:55,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:55,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:13:55,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:13:55,182 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:55,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:55,487 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-11-25 20:13:55,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 20:13:55,488 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-25 20:13:55,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:55,489 INFO L225 Difference]: With dead ends: 102 [2021-11-25 20:13:55,489 INFO L226 Difference]: Without dead ends: 100 [2021-11-25 20:13:55,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=497, Invalid=1483, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:13:55,491 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 110 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:55,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 123 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:55,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-25 20:13:55,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2021-11-25 20:13:55,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:55,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-11-25 20:13:55,499 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2021-11-25 20:13:55,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:55,500 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-11-25 20:13:55,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:55,500 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-11-25 20:13:55,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 20:13:55,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:55,502 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:55,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:55,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:13:55,717 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:55,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:55,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 15 times [2021-11-25 20:13:55,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:55,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037634886] [2021-11-25 20:13:55,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:55,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:55,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:56,103 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:56,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:56,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037634886] [2021-11-25 20:13:56,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037634886] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:56,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320625170] [2021-11-25 20:13:56,104 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:13:56,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:56,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:56,105 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:56,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:13:56,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:13:56,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:13:56,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:13:56,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:56,791 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:56,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:57,040 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:57,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320625170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:57,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [449129681] [2021-11-25 20:13:57,043 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:57,044 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:57,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:57,044 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:57,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:57,207 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:57,668 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9320#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:57,668 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:57,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:57,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 50 [2021-11-25 20:13:57,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614046718] [2021-11-25 20:13:57,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:57,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 20:13:57,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:57,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 20:13:57,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=2784, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 20:13:57,671 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:58,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:58,293 INFO L93 Difference]: Finished difference Result 260 states and 279 transitions. [2021-11-25 20:13:58,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:13:58,293 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-25 20:13:58,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:58,294 INFO L225 Difference]: With dead ends: 260 [2021-11-25 20:13:58,294 INFO L226 Difference]: Without dead ends: 142 [2021-11-25 20:13:58,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1582, Invalid=6074, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 20:13:58,297 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 163 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:58,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 348 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:13:58,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-25 20:13:58,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2021-11-25 20:13:58,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:58,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-11-25 20:13:58,305 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2021-11-25 20:13:58,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:58,306 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-11-25 20:13:58,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:13:58,306 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-11-25 20:13:58,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 20:13:58,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:58,307 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:58,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:58,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:13:58,513 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:13:58,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:58,514 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 16 times [2021-11-25 20:13:58,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:13:58,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240780871] [2021-11-25 20:13:58,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:58,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:13:58,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:58,762 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:58,762 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:13:58,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240780871] [2021-11-25 20:13:58,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240780871] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:58,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788454531] [2021-11-25 20:13:58,763 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:13:58,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:58,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:58,764 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:58,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:13:58,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:58,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 20:13:58,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:59,070 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:59,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:59,277 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:59,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788454531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:59,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1790384871] [2021-11-25 20:13:59,278 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:13:59,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:13:59,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:13:59,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:13:59,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:13:59,463 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:59,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10500#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:13:59,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:13:59,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:59,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2021-11-25 20:13:59,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629030511] [2021-11-25 20:13:59,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:59,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:13:59,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:13:59,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:13:59,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=707, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:13:59,820 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:00,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:00,096 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-11-25 20:14:00,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:14:00,096 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-25 20:14:00,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:00,097 INFO L225 Difference]: With dead ends: 114 [2021-11-25 20:14:00,097 INFO L226 Difference]: Without dead ends: 112 [2021-11-25 20:14:00,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=606, Invalid=1746, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:14:00,099 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 112 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:00,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 134 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:14:00,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-25 20:14:00,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2021-11-25 20:14:00,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:00,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-11-25 20:14:00,108 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2021-11-25 20:14:00,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:00,108 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-11-25 20:14:00,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:00,108 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-11-25 20:14:00,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 20:14:00,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:00,109 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:00,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:00,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:00,329 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:00,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:00,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 17 times [2021-11-25 20:14:00,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:00,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043215138] [2021-11-25 20:14:00,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:00,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:00,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:00,812 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:00,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:00,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043215138] [2021-11-25 20:14:00,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043215138] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:00,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936018679] [2021-11-25 20:14:00,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:00,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:00,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:00,814 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:00,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:14:00,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-25 20:14:00,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:00,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 20:14:00,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:01,682 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:01,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:01,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936018679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:01,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513370247] [2021-11-25 20:14:01,968 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:01,968 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:01,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:01,969 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:01,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:02,146 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:02,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11541#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:02,685 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:02,685 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:02,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 56 [2021-11-25 20:14:02,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864408127] [2021-11-25 20:14:02,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:02,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-25 20:14:02,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:02,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-25 20:14:02,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:14:02,688 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:03,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:03,414 INFO L93 Difference]: Finished difference Result 294 states and 315 transitions. [2021-11-25 20:14:03,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 20:14:03,414 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-25 20:14:03,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:03,415 INFO L225 Difference]: With dead ends: 294 [2021-11-25 20:14:03,415 INFO L226 Difference]: Without dead ends: 160 [2021-11-25 20:14:03,416 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2614 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1992, Invalid=7514, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 20:14:03,417 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 194 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:03,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 437 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:03,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-25 20:14:03,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2021-11-25 20:14:03,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:03,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-11-25 20:14:03,427 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-11-25 20:14:03,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:03,427 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-11-25 20:14:03,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:03,427 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-11-25 20:14:03,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-25 20:14:03,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:03,429 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:03,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:03,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-25 20:14:03,653 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:03,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:03,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 18 times [2021-11-25 20:14:03,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:03,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909619725] [2021-11-25 20:14:03,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:03,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:03,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:03,897 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:03,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:03,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909619725] [2021-11-25 20:14:03,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [909619725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:03,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732426319] [2021-11-25 20:14:03,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:03,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:03,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:03,901 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:03,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:14:03,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:03,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:03,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 20:14:03,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:04,221 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:04,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:04,479 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:04,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732426319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:04,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [414639716] [2021-11-25 20:14:04,481 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:04,481 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:04,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:04,482 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:04,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:04,620 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:04,951 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12871#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:04,951 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:04,951 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:04,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2021-11-25 20:14:04,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116337698] [2021-11-25 20:14:04,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:04,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 20:14:04,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:04,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 20:14:04,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=794, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:14:04,953 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:05,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:05,252 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2021-11-25 20:14:05,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 20:14:05,253 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-25 20:14:05,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:05,253 INFO L225 Difference]: With dead ends: 126 [2021-11-25 20:14:05,254 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 20:14:05,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 326 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=727, Invalid=2029, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:14:05,255 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:05,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 159 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:14:05,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 20:14:05,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2021-11-25 20:14:05,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:05,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-11-25 20:14:05,264 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2021-11-25 20:14:05,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:05,265 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-11-25 20:14:05,265 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:05,265 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-11-25 20:14:05,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-25 20:14:05,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:05,266 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:05,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:05,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:05,489 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:05,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:05,489 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 19 times [2021-11-25 20:14:05,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:05,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113487191] [2021-11-25 20:14:05,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:05,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:05,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:05,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113487191] [2021-11-25 20:14:05,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113487191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444109002] [2021-11-25 20:14:05,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:14:05,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:05,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:05,994 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:05,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:14:06,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:06,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:14:06,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:06,832 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:06,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:07,090 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:07,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444109002] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:07,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104411087] [2021-11-25 20:14:07,096 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:07,097 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:07,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:07,098 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:07,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:07,243 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:07,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14027#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:07,692 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:07,692 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:07,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2021-11-25 20:14:07,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624980802] [2021-11-25 20:14:07,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:07,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 20:14:07,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:07,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 20:14:07,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 20:14:07,694 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:08,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:08,221 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2021-11-25 20:14:08,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:14:08,222 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-25 20:14:08,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:08,223 INFO L225 Difference]: With dead ends: 250 [2021-11-25 20:14:08,223 INFO L226 Difference]: Without dead ends: 173 [2021-11-25 20:14:08,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 20:14:08,225 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 163 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:08,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 412 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:14:08,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-25 20:14:08,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2021-11-25 20:14:08,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:08,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-11-25 20:14:08,236 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2021-11-25 20:14:08,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:08,236 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-11-25 20:14:08,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:08,236 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-11-25 20:14:08,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-25 20:14:08,238 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:08,238 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:08,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:08,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:08,461 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:08,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:08,461 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 20 times [2021-11-25 20:14:08,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:08,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368371597] [2021-11-25 20:14:08,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:08,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:08,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:09,066 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:09,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:09,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368371597] [2021-11-25 20:14:09,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368371597] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:09,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322646272] [2021-11-25 20:14:09,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:09,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:09,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:09,077 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:09,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:14:09,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-25 20:14:09,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:09,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-25 20:14:09,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:10,100 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:10,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:10,354 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:10,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322646272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:10,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000485763] [2021-11-25 20:14:10,355 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:10,356 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:10,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:10,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:10,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:10,519 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:10,960 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15373#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:10,960 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:10,960 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:10,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-25 20:14:10,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479254795] [2021-11-25 20:14:10,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:10,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 20:14:10,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:10,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 20:14:10,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 20:14:10,963 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:11,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:11,457 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2021-11-25 20:14:11,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:14:11,457 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-25 20:14:11,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:11,459 INFO L225 Difference]: With dead ends: 257 [2021-11-25 20:14:11,459 INFO L226 Difference]: Without dead ends: 178 [2021-11-25 20:14:11,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 20:14:11,461 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 140 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:11,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 384 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:14:11,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-25 20:14:11,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2021-11-25 20:14:11,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:11,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-11-25 20:14:11,473 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2021-11-25 20:14:11,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:11,474 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-11-25 20:14:11,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:11,474 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-11-25 20:14:11,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-25 20:14:11,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:11,475 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:11,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:11,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:14:11,689 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:11,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:11,689 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 21 times [2021-11-25 20:14:11,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:11,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554956227] [2021-11-25 20:14:11,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:11,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:11,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:11,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:11,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:11,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554956227] [2021-11-25 20:14:11,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554956227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:11,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254696262] [2021-11-25 20:14:11,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:11,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:11,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:11,976 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:11,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:14:12,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:12,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:12,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 20:14:12,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:12,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:12,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:12,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254696262] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:12,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [950747606] [2021-11-25 20:14:12,512 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:12,512 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:12,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:12,513 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:12,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:12,662 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:12,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16711#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:12,985 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:12,985 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:12,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2021-11-25 20:14:12,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515770419] [2021-11-25 20:14:12,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:12,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:14:12,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:12,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:14:12,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=885, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:14:12,988 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:13,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:13,334 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2021-11-25 20:14:13,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:14:13,335 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-25 20:14:13,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:13,336 INFO L225 Difference]: With dead ends: 138 [2021-11-25 20:14:13,336 INFO L226 Difference]: Without dead ends: 136 [2021-11-25 20:14:13,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 919 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=860, Invalid=2332, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:14:13,337 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 96 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:13,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 194 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:14:13,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-25 20:14:13,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-11-25 20:14:13,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:13,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-11-25 20:14:13,347 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2021-11-25 20:14:13,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:13,347 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-11-25 20:14:13,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:13,348 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-11-25 20:14:13,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-25 20:14:13,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:13,348 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:13,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:13,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 20:14:13,549 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:13,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:13,550 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 22 times [2021-11-25 20:14:13,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:13,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280594555] [2021-11-25 20:14:13,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:13,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:13,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:14,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:14,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:14,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280594555] [2021-11-25 20:14:14,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280594555] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:14,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923463139] [2021-11-25 20:14:14,248 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:14:14,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:14,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:14,253 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:14,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:14:14,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:14,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 20:14:14,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:15,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:15,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:15,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923463139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:15,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [247957802] [2021-11-25 20:14:15,580 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:15,580 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:15,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:15,580 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:15,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:15,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:16,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17985#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:16,178 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:16,179 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:16,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2021-11-25 20:14:16,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912549197] [2021-11-25 20:14:16,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:16,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 20:14:16,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:16,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 20:14:16,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 20:14:16,180 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:16,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:16,798 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2021-11-25 20:14:16,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 20:14:16,798 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-25 20:14:16,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:16,800 INFO L225 Difference]: With dead ends: 276 [2021-11-25 20:14:16,800 INFO L226 Difference]: Without dead ends: 191 [2021-11-25 20:14:16,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2325 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 20:14:16,807 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 188 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:16,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 369 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:16,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-25 20:14:16,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2021-11-25 20:14:16,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:16,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-11-25 20:14:16,821 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2021-11-25 20:14:16,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:16,821 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-11-25 20:14:16,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:16,830 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-11-25 20:14:16,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 20:14:16,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:16,831 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:16,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:17,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:14:17,033 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:17,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:17,033 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 23 times [2021-11-25 20:14:17,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:17,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747948894] [2021-11-25 20:14:17,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:17,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:17,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:17,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:17,652 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:17,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747948894] [2021-11-25 20:14:17,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747948894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:17,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563839899] [2021-11-25 20:14:17,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:17,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:17,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:17,653 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:17,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:14:17,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-25 20:14:17,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:17,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 20:14:17,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:18,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:18,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:18,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:18,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563839899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:18,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [294173477] [2021-11-25 20:14:18,950 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:18,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:18,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:18,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:18,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:19,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:19,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19469#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:19,543 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:19,543 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:19,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2021-11-25 20:14:19,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179598288] [2021-11-25 20:14:19,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:19,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 20:14:19,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:19,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 20:14:19,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:14:19,545 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:20,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:20,152 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2021-11-25 20:14:20,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 20:14:20,153 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2021-11-25 20:14:20,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:20,155 INFO L225 Difference]: With dead ends: 283 [2021-11-25 20:14:20,155 INFO L226 Difference]: Without dead ends: 196 [2021-11-25 20:14:20,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 20:14:20,156 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 178 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:20,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 442 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:20,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-25 20:14:20,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2021-11-25 20:14:20,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:20,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-11-25 20:14:20,169 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2021-11-25 20:14:20,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:20,169 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-11-25 20:14:20,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:20,170 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-11-25 20:14:20,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 20:14:20,170 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:20,171 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:20,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:20,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 20:14:20,389 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:20,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:20,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 24 times [2021-11-25 20:14:20,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:20,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308237554] [2021-11-25 20:14:20,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:20,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:20,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:20,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:20,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:20,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308237554] [2021-11-25 20:14:20,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308237554] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:20,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128385254] [2021-11-25 20:14:20,733 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:20,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:20,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:20,734 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:20,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:14:20,818 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:20,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:20,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 20:14:20,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:21,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:21,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:21,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:21,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128385254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:21,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130599198] [2021-11-25 20:14:21,296 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:21,296 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:21,296 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:21,296 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:21,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:21,436 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:21,733 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20941#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:21,733 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:21,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:21,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2021-11-25 20:14:21,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440838902] [2021-11-25 20:14:21,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:21,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:14:21,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:21,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:14:21,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 20:14:21,735 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:22,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:22,217 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2021-11-25 20:14:22,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 20:14:22,218 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2021-11-25 20:14:22,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:22,219 INFO L225 Difference]: With dead ends: 150 [2021-11-25 20:14:22,219 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 20:14:22,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1005, Invalid=2655, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:14:22,220 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 171 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:22,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 191 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:14:22,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 20:14:22,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2021-11-25 20:14:22,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:22,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-11-25 20:14:22,232 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2021-11-25 20:14:22,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:22,233 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-11-25 20:14:22,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:22,233 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-11-25 20:14:22,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-25 20:14:22,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:22,234 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:22,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:22,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:14:22,449 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:22,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:22,449 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 25 times [2021-11-25 20:14:22,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:22,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518128281] [2021-11-25 20:14:22,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:22,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:22,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:23,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:23,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:23,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518128281] [2021-11-25 20:14:23,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518128281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:23,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182894648] [2021-11-25 20:14:23,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:14:23,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:23,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:23,132 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:23,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:14:23,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:23,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 20:14:23,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:24,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:24,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:24,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:24,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182894648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:24,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795456891] [2021-11-25 20:14:24,492 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:24,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:24,493 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:24,493 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:24,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:24,653 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:25,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22333#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:25,123 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:25,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:25,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2021-11-25 20:14:25,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105417873] [2021-11-25 20:14:25,124 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:25,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-25 20:14:25,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:25,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-25 20:14:25,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:14:25,125 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:25,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:25,860 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2021-11-25 20:14:25,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-25 20:14:25,861 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-25 20:14:25,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:25,862 INFO L225 Difference]: With dead ends: 302 [2021-11-25 20:14:25,862 INFO L226 Difference]: Without dead ends: 209 [2021-11-25 20:14:25,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2021-11-25 20:14:25,864 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 178 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:25,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 414 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:25,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-25 20:14:25,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2021-11-25 20:14:25,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:25,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-11-25 20:14:25,878 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2021-11-25 20:14:25,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:25,878 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-11-25 20:14:25,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:25,879 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-11-25 20:14:25,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 20:14:25,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:25,880 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:25,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:26,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:14:26,105 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:26,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:26,105 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 26 times [2021-11-25 20:14:26,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:26,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398887148] [2021-11-25 20:14:26,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:26,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:26,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:26,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:26,977 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:26,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398887148] [2021-11-25 20:14:26,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398887148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:26,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721767759] [2021-11-25 20:14:26,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:26,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:26,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:26,978 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:27,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:14:27,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-25 20:14:27,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:27,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:14:27,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:28,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:28,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:28,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721767759] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:28,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332902139] [2021-11-25 20:14:28,577 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:28,578 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:28,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:28,578 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:28,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:28,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:29,252 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23955#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:29,252 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:29,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:29,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2021-11-25 20:14:29,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626813682] [2021-11-25 20:14:29,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:29,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 20:14:29,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:29,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 20:14:29,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:14:29,254 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:29,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:29,900 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2021-11-25 20:14:29,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 20:14:29,900 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-25 20:14:29,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:29,902 INFO L225 Difference]: With dead ends: 309 [2021-11-25 20:14:29,902 INFO L226 Difference]: Without dead ends: 214 [2021-11-25 20:14:29,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2835 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 20:14:29,904 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 210 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:29,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 471 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:29,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-25 20:14:29,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2021-11-25 20:14:29,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:29,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-11-25 20:14:29,918 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2021-11-25 20:14:29,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:29,919 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-11-25 20:14:29,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:29,919 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-11-25 20:14:29,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 20:14:29,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:29,920 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:29,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-25 20:14:30,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:14:30,140 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:30,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:30,140 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 27 times [2021-11-25 20:14:30,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:30,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018499423] [2021-11-25 20:14:30,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:30,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:30,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:30,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:30,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018499423] [2021-11-25 20:14:30,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018499423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:30,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500650518] [2021-11-25 20:14:30,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:30,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:30,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:30,553 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:30,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:14:30,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:30,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:30,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 20:14:30,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:30,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:31,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:31,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500650518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:31,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1978928434] [2021-11-25 20:14:31,216 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:31,216 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:31,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:31,216 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:31,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:31,326 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:31,673 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25561#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:31,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:31,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:31,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2021-11-25 20:14:31,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696491890] [2021-11-25 20:14:31,674 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:31,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:14:31,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:31,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:14:31,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1079, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:14:31,675 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:32,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:32,073 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2021-11-25 20:14:32,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:14:32,073 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2021-11-25 20:14:32,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:32,074 INFO L225 Difference]: With dead ends: 162 [2021-11-25 20:14:32,074 INFO L226 Difference]: Without dead ends: 160 [2021-11-25 20:14:32,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1162, Invalid=2998, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:14:32,076 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 132 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:32,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 224 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:14:32,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-25 20:14:32,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2021-11-25 20:14:32,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:32,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-11-25 20:14:32,090 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2021-11-25 20:14:32,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:32,090 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-11-25 20:14:32,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:32,091 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-11-25 20:14:32,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-25 20:14:32,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:32,092 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:32,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:32,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:32,313 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:32,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:32,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 28 times [2021-11-25 20:14:32,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:32,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342832983] [2021-11-25 20:14:32,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:32,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:32,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:33,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:33,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342832983] [2021-11-25 20:14:33,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342832983] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:33,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532189325] [2021-11-25 20:14:33,148 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:14:33,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:33,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:33,150 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:33,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 20:14:33,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:33,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 20:14:33,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:34,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:34,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:34,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:34,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532189325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:34,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966814131] [2021-11-25 20:14:34,721 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:34,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:34,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:34,721 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:34,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:34,848 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:35,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27071#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:35,358 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:35,358 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:35,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2021-11-25 20:14:35,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831408790] [2021-11-25 20:14:35,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:35,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-25 20:14:35,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:35,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-25 20:14:35,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2021-11-25 20:14:35,360 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:36,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:36,089 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2021-11-25 20:14:36,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 20:14:36,093 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2021-11-25 20:14:36,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:36,094 INFO L225 Difference]: With dead ends: 328 [2021-11-25 20:14:36,095 INFO L226 Difference]: Without dead ends: 227 [2021-11-25 20:14:36,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3123 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 20:14:36,097 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 209 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:36,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 575 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:36,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-25 20:14:36,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2021-11-25 20:14:36,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:36,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-11-25 20:14:36,113 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2021-11-25 20:14:36,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:36,113 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-11-25 20:14:36,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:36,114 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-11-25 20:14:36,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-25 20:14:36,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:36,115 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:36,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:36,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-25 20:14:36,329 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:36,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:36,329 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 29 times [2021-11-25 20:14:36,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:36,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989105235] [2021-11-25 20:14:36,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:36,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:36,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:37,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:37,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989105235] [2021-11-25 20:14:37,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989105235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:37,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060505975] [2021-11-25 20:14:37,136 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:37,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:37,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:37,138 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:37,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:14:37,261 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 20:14:37,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:37,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 20:14:37,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:38,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:38,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:38,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:38,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060505975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:38,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624558983] [2021-11-25 20:14:38,788 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:38,788 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:38,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:38,789 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:38,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:38,908 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:39,409 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28831#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:39,409 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:39,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:39,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2021-11-25 20:14:39,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023380272] [2021-11-25 20:14:39,410 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:39,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-25 20:14:39,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:39,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-25 20:14:39,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 20:14:39,412 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:40,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:40,192 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2021-11-25 20:14:40,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 20:14:40,192 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2021-11-25 20:14:40,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:40,193 INFO L225 Difference]: With dead ends: 335 [2021-11-25 20:14:40,193 INFO L226 Difference]: Without dead ends: 232 [2021-11-25 20:14:40,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 426 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3256 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 20:14:40,195 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 204 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:40,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 576 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:40,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-25 20:14:40,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2021-11-25 20:14:40,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:40,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-11-25 20:14:40,210 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2021-11-25 20:14:40,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:40,210 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-11-25 20:14:40,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:40,211 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-11-25 20:14:40,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 20:14:40,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:40,212 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:40,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:40,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-25 20:14:40,437 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:40,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:40,437 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 30 times [2021-11-25 20:14:40,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:40,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78048833] [2021-11-25 20:14:40,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:40,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:40,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:40,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:40,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:40,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78048833] [2021-11-25 20:14:40,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78048833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:40,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510914311] [2021-11-25 20:14:40,852 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:40,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:40,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:40,853 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:40,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 20:14:40,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:40,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:40,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 20:14:40,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:41,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:41,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:41,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:41,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510914311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:41,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004367594] [2021-11-25 20:14:41,534 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:41,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:41,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:41,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:41,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:41,665 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:41,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30571#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:41,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:41,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:41,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2021-11-25 20:14:41,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933671655] [2021-11-25 20:14:41,980 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:41,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:14:41,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:41,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:14:41,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1182, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:14:41,981 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:42,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:42,421 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2021-11-25 20:14:42,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-25 20:14:42,422 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2021-11-25 20:14:42,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:42,423 INFO L225 Difference]: With dead ends: 174 [2021-11-25 20:14:42,423 INFO L226 Difference]: Without dead ends: 172 [2021-11-25 20:14:42,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 478 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1331, Invalid=3361, Unknown=0, NotChecked=0, Total=4692 [2021-11-25 20:14:42,425 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 204 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:42,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 216 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:14:42,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-25 20:14:42,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2021-11-25 20:14:42,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:42,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-11-25 20:14:42,440 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2021-11-25 20:14:42,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:42,441 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-11-25 20:14:42,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:42,441 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-11-25 20:14:42,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 20:14:42,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:42,443 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:42,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:42,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:42,661 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:42,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:42,661 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 31 times [2021-11-25 20:14:42,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:42,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950822305] [2021-11-25 20:14:42,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:42,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:42,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:43,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:43,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:43,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950822305] [2021-11-25 20:14:43,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950822305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:43,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862382483] [2021-11-25 20:14:43,577 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:14:43,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:43,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:43,578 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:43,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 20:14:43,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:43,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 20:14:43,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:44,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:44,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:45,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:14:45,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862382483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:45,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1649534346] [2021-11-25 20:14:45,269 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:45,269 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:45,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:45,269 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:45,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:45,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:45,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32199#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:45,906 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:45,907 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:45,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2021-11-25 20:14:45,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134934606] [2021-11-25 20:14:45,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:45,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 20:14:45,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:45,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 20:14:45,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2021-11-25 20:14:45,908 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:46,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:46,689 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2021-11-25 20:14:46,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:14:46,690 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 164 [2021-11-25 20:14:46,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:46,692 INFO L225 Difference]: With dead ends: 354 [2021-11-25 20:14:46,692 INFO L226 Difference]: Without dead ends: 245 [2021-11-25 20:14:46,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3564 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:14:46,694 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 226 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:46,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 600 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:46,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-25 20:14:46,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2021-11-25 20:14:46,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:46,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-11-25 20:14:46,710 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2021-11-25 20:14:46,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:46,710 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-11-25 20:14:46,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:46,711 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-11-25 20:14:46,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 20:14:46,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:46,712 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:46,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:46,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:46,921 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:46,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:46,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 32 times [2021-11-25 20:14:46,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:46,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081941657] [2021-11-25 20:14:46,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:46,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:46,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:47,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:47,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:47,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081941657] [2021-11-25 20:14:47,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081941657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:47,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137331177] [2021-11-25 20:14:47,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:14:47,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:47,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:47,904 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:47,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:14:48,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-25 20:14:48,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:48,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 20:14:48,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:49,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:49,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:49,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:49,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137331177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:49,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1386595520] [2021-11-25 20:14:49,388 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:49,388 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:49,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:49,389 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:49,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:49,512 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:50,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34096#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:50,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:50,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:50,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 29, 29] total 84 [2021-11-25 20:14:50,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450656095] [2021-11-25 20:14:50,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:50,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-25 20:14:50,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:50,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-25 20:14:50,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=7277, Unknown=0, NotChecked=0, Total=8556 [2021-11-25 20:14:50,073 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:52,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:52,661 INFO L93 Difference]: Finished difference Result 368 states and 399 transitions. [2021-11-25 20:14:52,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-25 20:14:52,661 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 166 [2021-11-25 20:14:52,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:52,662 INFO L225 Difference]: With dead ends: 368 [2021-11-25 20:14:52,662 INFO L226 Difference]: Without dead ends: 257 [2021-11-25 20:14:52,664 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 487 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13642 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=6088, Invalid=34112, Unknown=0, NotChecked=0, Total=40200 [2021-11-25 20:14:52,665 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 418 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 1770 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 2247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 1770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:52,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [418 Valid, 465 Invalid, 2247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [477 Valid, 1770 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:14:52,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-25 20:14:52,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 173. [2021-11-25 20:14:52,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:52,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-11-25 20:14:52,682 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2021-11-25 20:14:52,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:52,682 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-11-25 20:14:52,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:52,683 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-11-25 20:14:52,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-25 20:14:52,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:52,684 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:52,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:52,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 20:14:52,893 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:52,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:52,893 INFO L85 PathProgramCache]: Analyzing trace with hash -1621508872, now seen corresponding path program 33 times [2021-11-25 20:14:52,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:52,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603814998] [2021-11-25 20:14:52,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:52,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:52,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:53,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:53,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:14:53,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603814998] [2021-11-25 20:14:53,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603814998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:53,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801438470] [2021-11-25 20:14:53,876 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:14:53,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:53,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:53,877 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:53,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 20:14:53,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:14:53,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:53,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 20:14:53,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:55,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:55,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:55,447 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:14:55,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801438470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:55,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641206522] [2021-11-25 20:14:55,449 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:14:55,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:14:55,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:14:55,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:14:55,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:14:55,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:14:56,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36253#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:14:56,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:56,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:56,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 30, 30] total 87 [2021-11-25 20:14:56,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986000006] [2021-11-25 20:14:56,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:56,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-25 20:14:56,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:56,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-25 20:14:56,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=7753, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 20:14:56,139 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:58,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:58,873 INFO L93 Difference]: Finished difference Result 381 states and 413 transitions. [2021-11-25 20:14:58,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-25 20:14:58,874 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2021-11-25 20:14:58,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:58,875 INFO L225 Difference]: With dead ends: 381 [2021-11-25 20:14:58,875 INFO L226 Difference]: Without dead ends: 266 [2021-11-25 20:14:58,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 505 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14638 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6522, Invalid=36534, Unknown=0, NotChecked=0, Total=43056 [2021-11-25 20:14:58,878 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 552 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 1730 mSolverCounterSat, 621 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 621 IncrementalHoareTripleChecker+Valid, 1730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:58,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 396 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [621 Valid, 1730 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:14:58,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-25 20:14:58,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 179. [2021-11-25 20:14:58,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:58,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-11-25 20:14:58,896 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 172 [2021-11-25 20:14:58,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:58,897 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-11-25 20:14:58,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:14:58,897 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-11-25 20:14:58,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-25 20:14:58,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:58,898 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:58,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:59,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 20:14:59,109 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:14:59,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:59,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 34 times [2021-11-25 20:14:59,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:14:59,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161009551] [2021-11-25 20:14:59,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:59,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:14:59,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:00,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:00,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:00,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161009551] [2021-11-25 20:15:00,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1161009551] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:00,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80402687] [2021-11-25 20:15:00,289 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:15:00,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:00,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:00,290 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:00,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 20:15:00,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:00,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 20:15:00,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:01,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:01,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:02,282 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:02,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80402687] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:02,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026458324] [2021-11-25 20:15:02,283 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:02,284 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:02,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:02,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:02,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:02,419 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:03,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38487#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:03,059 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:03,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:03,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2021-11-25 20:15:03,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268690182] [2021-11-25 20:15:03,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:03,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-25 20:15:03,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:03,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-25 20:15:03,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2021-11-25 20:15:03,062 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:03,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:03,994 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2021-11-25 20:15:03,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-25 20:15:03,994 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2021-11-25 20:15:03,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:03,995 INFO L225 Difference]: With dead ends: 387 [2021-11-25 20:15:03,995 INFO L226 Difference]: Without dead ends: 268 [2021-11-25 20:15:03,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4182 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2021-11-25 20:15:03,997 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 327 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:03,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 691 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:15:03,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-25 20:15:04,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2021-11-25 20:15:04,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:04,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-11-25 20:15:04,015 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2021-11-25 20:15:04,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:04,016 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-11-25 20:15:04,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:04,016 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-11-25 20:15:04,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-25 20:15:04,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:04,017 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:04,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:04,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 20:15:04,245 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:04,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:04,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 35 times [2021-11-25 20:15:04,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:04,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972447981] [2021-11-25 20:15:04,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:04,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:04,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:04,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:04,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972447981] [2021-11-25 20:15:04,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972447981] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:04,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1450107620] [2021-11-25 20:15:04,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:04,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:04,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:04,819 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:04,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 20:15:04,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-25 20:15:04,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:04,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 20:15:04,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:05,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:05,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:05,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:05,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1450107620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:05,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136728577] [2021-11-25 20:15:05,654 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:05,654 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:05,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:05,655 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:05,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:05,806 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:06,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40495#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:06,140 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:06,140 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:06,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2021-11-25 20:15:06,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652467743] [2021-11-25 20:15:06,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:06,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:15:06,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:06,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:15:06,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1400, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:15:06,142 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:06,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:06,698 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2021-11-25 20:15:06,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 20:15:06,698 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 180 [2021-11-25 20:15:06,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:06,700 INFO L225 Difference]: With dead ends: 198 [2021-11-25 20:15:06,700 INFO L226 Difference]: Without dead ends: 196 [2021-11-25 20:15:06,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1705, Invalid=4147, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 20:15:06,701 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 166 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:06,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 296 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:15:06,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-25 20:15:06,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2021-11-25 20:15:06,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:06,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-11-25 20:15:06,725 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2021-11-25 20:15:06,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:06,726 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-11-25 20:15:06,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:06,726 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-11-25 20:15:06,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-25 20:15:06,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:06,727 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:06,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:06,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-25 20:15:06,953 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:06,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:06,953 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 36 times [2021-11-25 20:15:06,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:06,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752437497] [2021-11-25 20:15:06,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:06,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:07,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:08,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:08,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:08,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752437497] [2021-11-25 20:15:08,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752437497] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:08,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714374094] [2021-11-25 20:15:08,081 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:15:08,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:08,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:08,105 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:08,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 20:15:08,241 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:15:08,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:08,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 20:15:08,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:09,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:09,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:10,379 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:10,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714374094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:10,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1417150521] [2021-11-25 20:15:10,380 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:10,380 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:10,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:10,381 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:10,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:10,525 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:11,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42362#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:11,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:11,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:11,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 98 [2021-11-25 20:15:11,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44476052] [2021-11-25 20:15:11,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:11,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 20:15:11,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:11,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 20:15:11,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2270, Invalid=9072, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 20:15:11,108 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:12,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:12,891 INFO L93 Difference]: Finished difference Result 532 states and 567 transitions. [2021-11-25 20:15:12,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-25 20:15:12,892 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-25 20:15:12,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:12,895 INFO L225 Difference]: With dead ends: 532 [2021-11-25 20:15:12,895 INFO L226 Difference]: Without dead ends: 286 [2021-11-25 20:15:12,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 520 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7374 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6206, Invalid=21850, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 20:15:12,898 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 395 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 395 SdHoareTripleChecker+Valid, 877 SdHoareTripleChecker+Invalid, 1254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:12,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [395 Valid, 877 Invalid, 1254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:15:12,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-25 20:15:12,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2021-11-25 20:15:12,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:12,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-11-25 20:15:12,918 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-11-25 20:15:12,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:12,918 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-11-25 20:15:12,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:12,919 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-11-25 20:15:12,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-25 20:15:12,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:12,920 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:12,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:13,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 20:15:13,135 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:13,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:13,135 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 37 times [2021-11-25 20:15:13,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:13,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198097891] [2021-11-25 20:15:13,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:13,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:13,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:13,676 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:13,676 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:13,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198097891] [2021-11-25 20:15:13,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198097891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:13,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988617469] [2021-11-25 20:15:13,676 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:15:13,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:13,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:13,677 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:13,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 20:15:13,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:13,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-25 20:15:13,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:14,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:14,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:14,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:14,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988617469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:14,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [295572837] [2021-11-25 20:15:14,460 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:14,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:14,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:14,460 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:14,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:14,621 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:14,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44742#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:14,963 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:14,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:14,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2021-11-25 20:15:14,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236807819] [2021-11-25 20:15:14,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:14,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:15:14,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:14,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:15:14,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=1515, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:15:14,964 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:15,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:15,524 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2021-11-25 20:15:15,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-25 20:15:15,524 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-25 20:15:15,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:15,525 INFO L225 Difference]: With dead ends: 210 [2021-11-25 20:15:15,525 INFO L226 Difference]: Without dead ends: 208 [2021-11-25 20:15:15,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 592 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1910, Invalid=4570, Unknown=0, NotChecked=0, Total=6480 [2021-11-25 20:15:15,527 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 212 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:15,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 244 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:15:15,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-25 20:15:15,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2021-11-25 20:15:15,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:15,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-11-25 20:15:15,543 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2021-11-25 20:15:15,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:15,543 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-11-25 20:15:15,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:15,543 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-11-25 20:15:15,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-25 20:15:15,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:15,545 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:15,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:15,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 20:15:15,753 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:15,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:15,753 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 38 times [2021-11-25 20:15:15,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:15,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961089297] [2021-11-25 20:15:15,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:15,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:15,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:17,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:17,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:17,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961089297] [2021-11-25 20:15:17,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961089297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:17,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669897307] [2021-11-25 20:15:17,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:17,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:17,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:17,066 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:17,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 20:15:17,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-25 20:15:17,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:17,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 20:15:17,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:19,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:19,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:19,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:19,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669897307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:19,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [912119247] [2021-11-25 20:15:19,551 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:19,551 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:19,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:19,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:19,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:19,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:20,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46727#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:20,283 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:20,283 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:20,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 104 [2021-11-25 20:15:20,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400091824] [2021-11-25 20:15:20,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:20,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-25 20:15:20,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:20,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-25 20:15:20,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=10110, Unknown=0, NotChecked=0, Total=12656 [2021-11-25 20:15:20,286 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:22,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:22,171 INFO L93 Difference]: Finished difference Result 566 states and 603 transitions. [2021-11-25 20:15:22,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 20:15:22,171 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2021-11-25 20:15:22,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:22,173 INFO L225 Difference]: With dead ends: 566 [2021-11-25 20:15:22,173 INFO L226 Difference]: Without dead ends: 304 [2021-11-25 20:15:22,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 554 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8246 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=7000, Invalid=24506, Unknown=0, NotChecked=0, Total=31506 [2021-11-25 20:15:22,175 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 485 mSDsluCounter, 775 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 841 SdHoareTripleChecker+Invalid, 1276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:22,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 841 Invalid, 1276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:15:22,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-25 20:15:22,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2021-11-25 20:15:22,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:22,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-11-25 20:15:22,188 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2021-11-25 20:15:22,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:22,189 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-11-25 20:15:22,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:22,189 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-11-25 20:15:22,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-25 20:15:22,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:22,190 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:22,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:22,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:22,390 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:22,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:22,391 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 39 times [2021-11-25 20:15:22,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:22,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622896801] [2021-11-25 20:15:22,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:22,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:22,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:23,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:23,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622896801] [2021-11-25 20:15:23,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622896801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:23,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235560134] [2021-11-25 20:15:23,093 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:15:23,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:23,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:23,095 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:23,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 20:15:23,229 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:15:23,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:23,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 20:15:23,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:23,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:23,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:23,969 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:23,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235560134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:23,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964114192] [2021-11-25 20:15:23,970 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:23,970 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:23,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:23,971 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:23,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:24,117 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:24,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49257#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:24,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:24,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:24,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2021-11-25 20:15:24,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442914975] [2021-11-25 20:15:24,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:24,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:15:24,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:24,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:15:24,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1634, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:15:24,470 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:25,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:25,094 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2021-11-25 20:15:25,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-25 20:15:25,094 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 204 [2021-11-25 20:15:25,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:25,095 INFO L225 Difference]: With dead ends: 222 [2021-11-25 20:15:25,095 INFO L226 Difference]: Without dead ends: 220 [2021-11-25 20:15:25,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 630 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2127, Invalid=5013, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:15:25,096 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 186 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:25,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 319 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:15:25,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-25 20:15:25,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2021-11-25 20:15:25,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:25,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2021-11-25 20:15:25,121 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2021-11-25 20:15:25,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:25,121 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2021-11-25 20:15:25,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:25,121 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2021-11-25 20:15:25,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-25 20:15:25,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:25,122 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:25,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:25,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-25 20:15:25,323 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:25,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:25,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 40 times [2021-11-25 20:15:25,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:25,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387612405] [2021-11-25 20:15:25,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:25,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:25,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:26,780 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:26,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:26,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387612405] [2021-11-25 20:15:26,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387612405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:26,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003514157] [2021-11-25 20:15:26,781 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:15:26,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:26,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:26,782 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:26,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 20:15:26,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:26,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-25 20:15:26,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:28,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:28,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:29,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:29,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003514157] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:29,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [492553632] [2021-11-25 20:15:29,309 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:29,310 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:29,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:29,310 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:29,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:29,447 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:30,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51357#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:30,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:30,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:30,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2021-11-25 20:15:30,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183050455] [2021-11-25 20:15:30,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:30,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-25 20:15:30,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:30,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-25 20:15:30,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2021-11-25 20:15:30,066 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:31,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:31,292 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2021-11-25 20:15:31,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-25 20:15:31,292 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 212 [2021-11-25 20:15:31,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:31,293 INFO L225 Difference]: With dead ends: 458 [2021-11-25 20:15:31,294 INFO L226 Difference]: Without dead ends: 317 [2021-11-25 20:15:31,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 591 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2021-11-25 20:15:31,296 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 299 mSDsluCounter, 751 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:31,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 821 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:15:31,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-25 20:15:31,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2021-11-25 20:15:31,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:31,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2021-11-25 20:15:31,322 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2021-11-25 20:15:31,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:31,323 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2021-11-25 20:15:31,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:31,324 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2021-11-25 20:15:31,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-25 20:15:31,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:31,325 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:31,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:31,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-25 20:15:31,553 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:31,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:31,553 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 41 times [2021-11-25 20:15:31,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:31,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955226675] [2021-11-25 20:15:31,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:31,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:31,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:33,232 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:33,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:33,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955226675] [2021-11-25 20:15:33,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955226675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:33,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888604755] [2021-11-25 20:15:33,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:33,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:33,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:33,233 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:33,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 20:15:33,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-25 20:15:33,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:33,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-25 20:15:33,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:35,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:35,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:35,911 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:35,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888604755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:35,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149823480] [2021-11-25 20:15:35,912 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:35,912 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:35,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:35,913 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:35,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:36,033 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:36,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53807#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:36,656 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:36,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:36,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2021-11-25 20:15:36,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235064478] [2021-11-25 20:15:36,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:36,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-25 20:15:36,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:36,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-25 20:15:36,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:15:36,658 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:37,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:37,871 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2021-11-25 20:15:37,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-25 20:15:37,871 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 214 [2021-11-25 20:15:37,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:37,872 INFO L225 Difference]: With dead ends: 465 [2021-11-25 20:15:37,873 INFO L226 Difference]: Without dead ends: 322 [2021-11-25 20:15:37,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 596 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5781 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2021-11-25 20:15:37,874 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 384 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 1023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:37,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 670 Invalid, 1023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [322 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:15:37,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-25 20:15:37,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2021-11-25 20:15:37,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:37,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-11-25 20:15:37,907 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2021-11-25 20:15:37,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:37,907 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-11-25 20:15:37,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:37,907 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-11-25 20:15:37,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-11-25 20:15:37,908 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:37,908 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:37,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:38,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:38,109 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:38,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:38,109 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 42 times [2021-11-25 20:15:38,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:38,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112609251] [2021-11-25 20:15:38,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:38,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:38,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:38,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112609251] [2021-11-25 20:15:38,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112609251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:38,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695099734] [2021-11-25 20:15:38,802 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:15:38,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:38,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:38,803 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:38,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 20:15:38,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:15:38,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:38,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 20:15:38,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:39,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:39,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:39,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:39,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695099734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:39,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085083174] [2021-11-25 20:15:39,634 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:39,634 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:39,634 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:39,634 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:39,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:39,754 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:40,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56217#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:40,114 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:40,114 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:40,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2021-11-25 20:15:40,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890151750] [2021-11-25 20:15:40,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:40,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-25 20:15:40,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:40,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-25 20:15:40,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=1757, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:15:40,116 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:40,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:40,785 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2021-11-25 20:15:40,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-25 20:15:40,786 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 216 [2021-11-25 20:15:40,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:40,787 INFO L225 Difference]: With dead ends: 234 [2021-11-25 20:15:40,787 INFO L226 Difference]: Without dead ends: 232 [2021-11-25 20:15:40,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 668 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2199 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2356, Invalid=5476, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 20:15:40,789 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 264 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:40,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 294 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:15:40,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-25 20:15:40,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2021-11-25 20:15:40,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:40,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2021-11-25 20:15:40,821 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2021-11-25 20:15:40,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:40,821 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2021-11-25 20:15:40,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:40,822 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2021-11-25 20:15:40,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-25 20:15:40,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:40,823 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:40,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-25 20:15:41,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:41,033 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:41,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:41,033 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 43 times [2021-11-25 20:15:41,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:41,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785411777] [2021-11-25 20:15:41,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:41,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:41,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:42,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:42,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:42,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785411777] [2021-11-25 20:15:42,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785411777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:42,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325465057] [2021-11-25 20:15:42,744 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:15:42,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:42,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:42,745 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:42,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 20:15:42,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:42,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 20:15:42,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:45,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:45,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:45,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:15:45,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325465057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:45,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822799322] [2021-11-25 20:15:45,502 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:45,502 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:45,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:45,503 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:45,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:45,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:46,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58435#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:46,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:46,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:46,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2021-11-25 20:15:46,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999257367] [2021-11-25 20:15:46,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:46,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-25 20:15:46,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:46,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-25 20:15:46,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2021-11-25 20:15:46,267 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:47,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:47,618 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2021-11-25 20:15:47,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-25 20:15:47,618 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 224 [2021-11-25 20:15:47,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:47,620 INFO L225 Difference]: With dead ends: 484 [2021-11-25 20:15:47,620 INFO L226 Difference]: Without dead ends: 335 [2021-11-25 20:15:47,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 625 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6189 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2021-11-25 20:15:47,621 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 332 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 1241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:47,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 871 Invalid, 1241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:15:47,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-11-25 20:15:47,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2021-11-25 20:15:47,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:47,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2021-11-25 20:15:47,646 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2021-11-25 20:15:47,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:47,647 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2021-11-25 20:15:47,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:47,647 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2021-11-25 20:15:47,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-25 20:15:47,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:47,649 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:47,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:47,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-25 20:15:47,861 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:47,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:47,861 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 44 times [2021-11-25 20:15:47,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:47,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220838652] [2021-11-25 20:15:47,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:47,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:47,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:49,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:49,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:49,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220838652] [2021-11-25 20:15:49,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220838652] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:49,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182226954] [2021-11-25 20:15:49,503 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:49,503 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:49,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:49,504 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:49,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 20:15:49,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-11-25 20:15:49,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:49,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-25 20:15:49,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:52,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:52,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:52,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182226954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:52,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1492616977] [2021-11-25 20:15:52,498 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:52,498 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:52,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:52,499 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:52,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:52,662 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:53,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61023#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:53,318 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:53,318 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:53,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2021-11-25 20:15:53,319 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925295033] [2021-11-25 20:15:53,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:53,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-25 20:15:53,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:53,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-25 20:15:53,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 20:15:53,323 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:54,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:54,851 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2021-11-25 20:15:54,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-25 20:15:54,851 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 226 [2021-11-25 20:15:54,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:54,853 INFO L225 Difference]: With dead ends: 491 [2021-11-25 20:15:54,853 INFO L226 Difference]: Without dead ends: 340 [2021-11-25 20:15:54,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6370 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2021-11-25 20:15:54,856 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 281 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 918 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:54,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 918 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:15:54,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-25 20:15:54,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2021-11-25 20:15:54,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:54,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2021-11-25 20:15:54,882 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2021-11-25 20:15:54,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:54,882 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2021-11-25 20:15:54,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:54,883 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2021-11-25 20:15:54,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-25 20:15:54,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:54,884 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:54,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:55,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-25 20:15:55,105 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:55,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:55,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 45 times [2021-11-25 20:15:55,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:55,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825179243] [2021-11-25 20:15:55,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:55,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:55,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:55,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:55,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:55,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825179243] [2021-11-25 20:15:55,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825179243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:55,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395727325] [2021-11-25 20:15:55,840 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:15:55,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:55,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:55,841 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:55,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 20:15:55,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:15:55,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:55,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-25 20:15:55,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:56,458 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:56,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:56,945 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:15:56,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395727325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:56,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531782565] [2021-11-25 20:15:56,946 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:15:56,946 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:56,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:56,947 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:56,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:57,078 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:57,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63567#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:15:57,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:15:57,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:57,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2021-11-25 20:15:57,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739597400] [2021-11-25 20:15:57,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:57,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:15:57,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:15:57,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:15:57,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=1884, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:15:57,457 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:58,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:58,242 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2021-11-25 20:15:58,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-25 20:15:58,242 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-25 20:15:58,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:58,246 INFO L225 Difference]: With dead ends: 246 [2021-11-25 20:15:58,246 INFO L226 Difference]: Without dead ends: 244 [2021-11-25 20:15:58,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 706 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2395 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2597, Invalid=5959, Unknown=0, NotChecked=0, Total=8556 [2021-11-25 20:15:58,249 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 208 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:58,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 345 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:15:58,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-25 20:15:58,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2021-11-25 20:15:58,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:58,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2021-11-25 20:15:58,287 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2021-11-25 20:15:58,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:58,287 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2021-11-25 20:15:58,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:15:58,288 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2021-11-25 20:15:58,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-25 20:15:58,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:58,289 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:58,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:58,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 20:15:58,504 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:58,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:58,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 46 times [2021-11-25 20:15:58,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:58,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568760788] [2021-11-25 20:15:58,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:58,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:58,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:00,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:00,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:00,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568760788] [2021-11-25 20:16:00,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568760788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:00,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054491810] [2021-11-25 20:16:00,221 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:16:00,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:00,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:00,222 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:00,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 20:16:00,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:00,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-25 20:16:00,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:02,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:03,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:03,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054491810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:03,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2103807347] [2021-11-25 20:16:03,342 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:03,342 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:03,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:03,343 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:03,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:03,454 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:04,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65903#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:04,138 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:04,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:04,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2021-11-25 20:16:04,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199202235] [2021-11-25 20:16:04,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:04,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-25 20:16:04,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:04,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-25 20:16:04,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2021-11-25 20:16:04,141 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:05,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:05,665 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2021-11-25 20:16:05,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-25 20:16:05,665 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 236 [2021-11-25 20:16:05,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:05,666 INFO L225 Difference]: With dead ends: 510 [2021-11-25 20:16:05,666 INFO L226 Difference]: Without dead ends: 353 [2021-11-25 20:16:05,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 659 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6798 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2021-11-25 20:16:05,668 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 382 mSDsluCounter, 724 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:05,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 802 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:16:05,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-25 20:16:05,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2021-11-25 20:16:05,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:05,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2021-11-25 20:16:05,697 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2021-11-25 20:16:05,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:05,697 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2021-11-25 20:16:05,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:05,698 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2021-11-25 20:16:05,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-25 20:16:05,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:05,699 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:05,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:05,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 20:16:05,913 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:05,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:05,913 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 47 times [2021-11-25 20:16:05,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:05,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896363868] [2021-11-25 20:16:05,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:05,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:05,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:07,663 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:07,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:07,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896363868] [2021-11-25 20:16:07,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896363868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:07,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901166858] [2021-11-25 20:16:07,664 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:07,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:07,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:07,666 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:07,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 20:16:07,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2021-11-25 20:16:07,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:07,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-25 20:16:07,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:10,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:10,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:10,928 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:10,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901166858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:10,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [860694506] [2021-11-25 20:16:10,929 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:10,930 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:10,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:10,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:10,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:11,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:11,829 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68629#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:11,829 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:11,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:11,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2021-11-25 20:16:11,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059576731] [2021-11-25 20:16:11,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:11,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-25 20:16:11,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:11,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-25 20:16:11,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2021-11-25 20:16:11,832 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:13,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:13,339 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2021-11-25 20:16:13,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-25 20:16:13,339 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 238 [2021-11-25 20:16:13,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:13,341 INFO L225 Difference]: With dead ends: 517 [2021-11-25 20:16:13,341 INFO L226 Difference]: Without dead ends: 358 [2021-11-25 20:16:13,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 664 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6987 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 20:16:13,344 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 343 mSDsluCounter, 773 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:13,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 853 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:16:13,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-25 20:16:13,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2021-11-25 20:16:13,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:13,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2021-11-25 20:16:13,371 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2021-11-25 20:16:13,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:13,372 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2021-11-25 20:16:13,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:13,372 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2021-11-25 20:16:13,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-25 20:16:13,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:13,374 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:13,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:13,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 20:16:13,597 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:13,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:13,597 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 48 times [2021-11-25 20:16:13,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:13,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869478333] [2021-11-25 20:16:13,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:13,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:13,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:14,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:14,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:14,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869478333] [2021-11-25 20:16:14,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869478333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:14,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929849568] [2021-11-25 20:16:14,337 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:16:14,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:14,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:14,338 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:14,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 20:16:14,456 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:16:14,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:14,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 20:16:14,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:14,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:14,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:15,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:15,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929849568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:15,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713125419] [2021-11-25 20:16:15,278 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:15,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:15,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:15,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:15,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:15,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:15,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71307#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:15,797 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:15,797 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:15,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2021-11-25 20:16:15,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094947148] [2021-11-25 20:16:15,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:15,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:16:15,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:15,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:16:15,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2015, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:16:15,798 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:16,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:16,573 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2021-11-25 20:16:16,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-25 20:16:16,574 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 240 [2021-11-25 20:16:16,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:16,575 INFO L225 Difference]: With dead ends: 258 [2021-11-25 20:16:16,575 INFO L226 Difference]: Without dead ends: 256 [2021-11-25 20:16:16,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 744 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2850, Invalid=6462, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 20:16:16,576 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 304 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:16,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 292 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:16:16,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-25 20:16:16,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2021-11-25 20:16:16,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:16,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2021-11-25 20:16:16,605 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2021-11-25 20:16:16,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:16,605 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2021-11-25 20:16:16,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:16,605 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2021-11-25 20:16:16,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-25 20:16:16,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:16,607 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:16,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:16,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:16,833 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:16,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:16,833 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 49 times [2021-11-25 20:16:16,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:16,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042801985] [2021-11-25 20:16:16,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:16,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:16,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:18,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:18,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:18,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042801985] [2021-11-25 20:16:18,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042801985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:18,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545449676] [2021-11-25 20:16:18,753 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:16:18,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:18,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:18,754 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:18,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 20:16:18,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:18,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-25 20:16:18,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:21,536 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:21,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:21,959 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:21,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545449676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:21,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91618199] [2021-11-25 20:16:21,960 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:21,960 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:21,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:21,960 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:21,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:22,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:22,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73761#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:22,808 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:22,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:22,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2021-11-25 20:16:22,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688514560] [2021-11-25 20:16:22,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:22,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-25 20:16:22,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:22,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-25 20:16:22,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2021-11-25 20:16:22,811 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:24,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:24,418 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2021-11-25 20:16:24,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-25 20:16:24,418 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 248 [2021-11-25 20:16:24,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:24,419 INFO L225 Difference]: With dead ends: 536 [2021-11-25 20:16:24,419 INFO L226 Difference]: Without dead ends: 371 [2021-11-25 20:16:24,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 693 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7435 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2021-11-25 20:16:24,421 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 465 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 815 mSolverCounterSat, 503 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 503 IncrementalHoareTripleChecker+Valid, 815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:24,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [465 Valid, 776 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [503 Valid, 815 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:16:24,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-11-25 20:16:24,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2021-11-25 20:16:24,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:24,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2021-11-25 20:16:24,445 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2021-11-25 20:16:24,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:24,445 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2021-11-25 20:16:24,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:24,445 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2021-11-25 20:16:24,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-25 20:16:24,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:24,446 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:24,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:24,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:24,647 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:24,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:24,647 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 50 times [2021-11-25 20:16:24,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:24,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639889485] [2021-11-25 20:16:24,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:24,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:24,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:26,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:26,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:26,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639889485] [2021-11-25 20:16:26,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639889485] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:26,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391617929] [2021-11-25 20:16:26,542 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:26,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:26,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:26,544 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:26,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 20:16:26,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-25 20:16:26,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:26,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-25 20:16:26,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:29,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:29,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:29,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:29,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391617929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:29,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729612705] [2021-11-25 20:16:29,926 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:29,927 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:29,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:29,927 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:29,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:30,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:30,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76625#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:30,765 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:30,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:30,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2021-11-25 20:16:30,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612453769] [2021-11-25 20:16:30,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:30,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-25 20:16:30,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:30,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-25 20:16:30,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 20:16:30,767 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:32,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:32,395 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2021-11-25 20:16:32,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-25 20:16:32,395 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 250 [2021-11-25 20:16:32,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:32,397 INFO L225 Difference]: With dead ends: 543 [2021-11-25 20:16:32,397 INFO L226 Difference]: Without dead ends: 376 [2021-11-25 20:16:32,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 698 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7632 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2021-11-25 20:16:32,399 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 352 mSDsluCounter, 879 mSDsCounter, 0 mSdLazyCounter, 1012 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 1012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:32,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 963 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 1012 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:16:32,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-25 20:16:32,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2021-11-25 20:16:32,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:32,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2021-11-25 20:16:32,418 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2021-11-25 20:16:32,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:32,418 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2021-11-25 20:16:32,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:32,419 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2021-11-25 20:16:32,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-25 20:16:32,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:32,420 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:32,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:32,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-25 20:16:32,641 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:32,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:32,641 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 51 times [2021-11-25 20:16:32,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:32,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657693137] [2021-11-25 20:16:32,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:32,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:32,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:33,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:33,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:33,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657693137] [2021-11-25 20:16:33,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657693137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:33,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579848540] [2021-11-25 20:16:33,672 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:16:33,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:33,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:33,674 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:33,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 20:16:33,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:16:33,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:33,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 20:16:33,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:34,289 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:34,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:34,714 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:34,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579848540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:34,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [18746929] [2021-11-25 20:16:34,715 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:34,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:34,716 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:34,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:34,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:34,834 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:35,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79437#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:35,221 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:35,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:35,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2021-11-25 20:16:35,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164469231] [2021-11-25 20:16:35,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:35,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 20:16:35,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:35,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 20:16:35,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=2150, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:16:35,223 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:36,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:36,029 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2021-11-25 20:16:36,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-25 20:16:36,029 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2021-11-25 20:16:36,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:36,030 INFO L225 Difference]: With dead ends: 270 [2021-11-25 20:16:36,031 INFO L226 Difference]: Without dead ends: 268 [2021-11-25 20:16:36,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 782 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3115, Invalid=6985, Unknown=0, NotChecked=0, Total=10100 [2021-11-25 20:16:36,032 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 317 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:36,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 316 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:16:36,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-25 20:16:36,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2021-11-25 20:16:36,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:36,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2021-11-25 20:16:36,058 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2021-11-25 20:16:36,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:36,059 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2021-11-25 20:16:36,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:36,059 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2021-11-25 20:16:36,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-25 20:16:36,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:36,061 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:36,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:36,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-25 20:16:36,279 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:36,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:36,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 52 times [2021-11-25 20:16:36,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:36,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376249850] [2021-11-25 20:16:36,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:36,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:36,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:38,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:38,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:38,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376249850] [2021-11-25 20:16:38,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376249850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:38,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869616165] [2021-11-25 20:16:38,325 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:16:38,325 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:38,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:38,326 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:38,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 20:16:38,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:38,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 20:16:38,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:41,395 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:41,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:41,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:16:41,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869616165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:41,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [307582006] [2021-11-25 20:16:41,865 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:41,865 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:41,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:41,865 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:41,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:41,971 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:42,682 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82009#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:42,682 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:42,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:42,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2021-11-25 20:16:42,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630438478] [2021-11-25 20:16:42,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:42,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-25 20:16:42,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:42,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-25 20:16:42,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2021-11-25 20:16:42,685 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:44,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:44,416 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2021-11-25 20:16:44,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-25 20:16:44,416 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 260 [2021-11-25 20:16:44,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:44,418 INFO L225 Difference]: With dead ends: 562 [2021-11-25 20:16:44,418 INFO L226 Difference]: Without dead ends: 389 [2021-11-25 20:16:44,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 727 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8100 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2021-11-25 20:16:44,420 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 390 mSDsluCounter, 1009 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 1490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:44,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [390 Valid, 1095 Invalid, 1490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:16:44,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-11-25 20:16:44,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2021-11-25 20:16:44,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:44,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2021-11-25 20:16:44,445 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2021-11-25 20:16:44,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:44,445 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2021-11-25 20:16:44,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:44,446 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2021-11-25 20:16:44,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-25 20:16:44,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:44,447 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:44,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:44,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:44,661 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:44,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:44,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 53 times [2021-11-25 20:16:44,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:44,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3763602] [2021-11-25 20:16:44,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:44,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:44,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:46,802 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:46,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:46,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3763602] [2021-11-25 20:16:46,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3763602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:46,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982995403] [2021-11-25 20:16:46,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:46,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:46,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:46,803 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:46,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 20:16:47,016 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-25 20:16:47,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:47,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-25 20:16:47,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:49,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:49,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:49,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:49,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982995403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:49,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702351756] [2021-11-25 20:16:49,711 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:16:49,712 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:49,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:49,712 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:49,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:49,832 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:16:50,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85010#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:16:50,555 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:50,555 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:50,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 45, 45] total 132 [2021-11-25 20:16:50,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48413253] [2021-11-25 20:16:50,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:50,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-25 20:16:50,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:50,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-25 20:16:50,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3047, Invalid=16693, Unknown=0, NotChecked=0, Total=19740 [2021-11-25 20:16:50,558 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:55,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:55,794 INFO L93 Difference]: Finished difference Result 576 states and 623 transitions. [2021-11-25 20:16:55,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-11-25 20:16:55,794 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 262 [2021-11-25 20:16:55,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:55,796 INFO L225 Difference]: With dead ends: 576 [2021-11-25 20:16:55,796 INFO L226 Difference]: Without dead ends: 401 [2021-11-25 20:16:55,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 775 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33778 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=14832, Invalid=82824, Unknown=0, NotChecked=0, Total=97656 [2021-11-25 20:16:55,800 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 742 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 2786 mSolverCounterSat, 680 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 742 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 3466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 680 IncrementalHoareTripleChecker+Valid, 2786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:55,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [742 Valid, 677 Invalid, 3466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [680 Valid, 2786 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 20:16:55,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-25 20:16:55,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 269. [2021-11-25 20:16:55,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:55,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2021-11-25 20:16:55,847 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 262 [2021-11-25 20:16:55,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:55,847 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2021-11-25 20:16:55,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:16:55,848 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2021-11-25 20:16:55,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-25 20:16:55,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:55,849 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:55,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:56,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:56,068 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:56,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:56,069 INFO L85 PathProgramCache]: Analyzing trace with hash -1043592072, now seen corresponding path program 54 times [2021-11-25 20:16:56,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:56,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126547845] [2021-11-25 20:16:56,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:56,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:56,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:58,294 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:16:58,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:58,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126547845] [2021-11-25 20:16:58,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126547845] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:58,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812630447] [2021-11-25 20:16:58,294 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:16:58,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:58,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:58,295 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:58,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 20:16:58,423 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:16:58,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:58,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-25 20:16:58,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:01,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:02,013 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:02,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812630447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:02,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761366223] [2021-11-25 20:17:02,014 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:02,014 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:02,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:02,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:02,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:02,147 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:02,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88384#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:02,882 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:02,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:02,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 136 [2021-11-25 20:17:02,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578115952] [2021-11-25 20:17:02,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:02,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-25 20:17:02,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:02,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-25 20:17:02,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4259, Invalid=16621, Unknown=0, NotChecked=0, Total=20880 [2021-11-25 20:17:02,886 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:04,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:04,766 INFO L93 Difference]: Finished difference Result 582 states and 629 transitions. [2021-11-25 20:17:04,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-25 20:17:04,767 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2021-11-25 20:17:04,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:04,768 INFO L225 Difference]: With dead ends: 582 [2021-11-25 20:17:04,769 INFO L226 Difference]: Without dead ends: 403 [2021-11-25 20:17:04,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 749 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8652 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8221, Invalid=27311, Unknown=0, NotChecked=0, Total=35532 [2021-11-25 20:17:04,772 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 367 mSDsluCounter, 970 mSDsCounter, 0 mSdLazyCounter, 1098 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 1398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 1098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:04,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [367 Valid, 1060 Invalid, 1398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 1098 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:17:04,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-25 20:17:04,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 271. [2021-11-25 20:17:04,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.011111111111111) internal successors, (273), 270 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:04,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 273 transitions. [2021-11-25 20:17:04,794 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 273 transitions. Word has length 268 [2021-11-25 20:17:04,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:04,794 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 273 transitions. [2021-11-25 20:17:04,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:04,795 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 273 transitions. [2021-11-25 20:17:04,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-25 20:17:04,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:04,797 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:04,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:05,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-25 20:17:05,022 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:05,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:05,022 INFO L85 PathProgramCache]: Analyzing trace with hash -751406499, now seen corresponding path program 55 times [2021-11-25 20:17:05,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:05,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210829951] [2021-11-25 20:17:05,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:05,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:06,030 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1892 proven. 3786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:06,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:06,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210829951] [2021-11-25 20:17:06,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210829951] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:06,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17174166] [2021-11-25 20:17:06,031 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:17:06,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:06,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:06,032 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:06,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 20:17:06,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:06,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-25 20:17:06,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:06,619 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:06,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:07,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:07,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17174166] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:07,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588801744] [2021-11-25 20:17:07,053 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:07,053 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:07,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:07,053 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:07,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:07,202 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:07,601 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91397#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:07,601 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:07,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:07,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 50 [2021-11-25 20:17:07,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538245920] [2021-11-25 20:17:07,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:07,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 20:17:07,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:07,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 20:17:07,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1180, Invalid=2360, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 20:17:07,603 INFO L87 Difference]: Start difference. First operand 271 states and 273 transitions. Second operand has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:08,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:08,531 INFO L93 Difference]: Finished difference Result 288 states and 291 transitions. [2021-11-25 20:17:08,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 20:17:08,531 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 270 [2021-11-25 20:17:08,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:08,533 INFO L225 Difference]: With dead ends: 288 [2021-11-25 20:17:08,533 INFO L226 Difference]: Without dead ends: 286 [2021-11-25 20:17:08,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 945 GetRequests, 839 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3144 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3535, Invalid=7807, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 20:17:08,534 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 331 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:08,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 368 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:17:08,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-25 20:17:08,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 279. [2021-11-25 20:17:08,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0107913669064748) internal successors, (281), 278 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:08,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 281 transitions. [2021-11-25 20:17:08,555 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 281 transitions. Word has length 270 [2021-11-25 20:17:08,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:08,555 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 281 transitions. [2021-11-25 20:17:08,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:08,556 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 281 transitions. [2021-11-25 20:17:08,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-25 20:17:08,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:08,557 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:08,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:08,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-25 20:17:08,773 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:08,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:08,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1028462403, now seen corresponding path program 56 times [2021-11-25 20:17:08,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:08,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033918999] [2021-11-25 20:17:08,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:08,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:08,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:11,041 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 3918 proven. 2112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:11,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:11,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033918999] [2021-11-25 20:17:11,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033918999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:11,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20927471] [2021-11-25 20:17:11,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:11,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:11,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:11,043 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:11,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 20:17:11,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-25 20:17:11,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:11,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-25 20:17:11,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:14,632 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:14,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:15,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:15,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20927471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:15,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945103480] [2021-11-25 20:17:15,172 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:15,172 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:15,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:15,172 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:15,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:15,280 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:16,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94149#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:16,083 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:16,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:16,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 143 [2021-11-25 20:17:16,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427005266] [2021-11-25 20:17:16,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:16,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-25 20:17:16,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:16,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-25 20:17:16,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4730, Invalid=18222, Unknown=0, NotChecked=0, Total=22952 [2021-11-25 20:17:16,086 INFO L87 Difference]: Start difference. First operand 279 states and 281 transitions. Second operand has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:19,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:19,474 INFO L93 Difference]: Finished difference Result 787 states and 837 transitions. [2021-11-25 20:17:19,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-25 20:17:19,474 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 278 [2021-11-25 20:17:19,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:19,476 INFO L225 Difference]: With dead ends: 787 [2021-11-25 20:17:19,476 INFO L226 Difference]: Without dead ends: 421 [2021-11-25 20:17:19,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15084 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=13331, Invalid=45475, Unknown=0, NotChecked=0, Total=58806 [2021-11-25 20:17:19,478 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 668 mSDsluCounter, 1256 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 481 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 1348 SdHoareTripleChecker+Invalid, 1895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:19,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 1348 Invalid, 1895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:17:19,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-25 20:17:19,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 283. [2021-11-25 20:17:19,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0106382978723405) internal successors, (285), 282 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:19,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 285 transitions. [2021-11-25 20:17:19,514 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 285 transitions. Word has length 278 [2021-11-25 20:17:19,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:19,514 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 285 transitions. [2021-11-25 20:17:19,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:19,515 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 285 transitions. [2021-11-25 20:17:19,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-25 20:17:19,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:19,516 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:19,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:19,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 20:17:19,733 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:19,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:19,733 INFO L85 PathProgramCache]: Analyzing trace with hash -863970995, now seen corresponding path program 57 times [2021-11-25 20:17:19,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:19,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976381579] [2021-11-25 20:17:19,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:19,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:19,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:20,670 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2070 proven. 4142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:20,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:20,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976381579] [2021-11-25 20:17:20,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976381579] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:20,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084857207] [2021-11-25 20:17:20,671 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:17:20,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:20,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:20,673 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:20,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 20:17:20,814 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:17:20,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:20,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 1047 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-25 20:17:20,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:21,265 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:21,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:21,739 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:21,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084857207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:21,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805667334] [2021-11-25 20:17:21,740 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:21,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:21,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:21,741 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:21,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:21,883 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:22,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97654#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:22,291 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:22,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:22,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2021-11-25 20:17:22,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221817757] [2021-11-25 20:17:22,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:22,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:17:22,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:22,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:17:22,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=2505, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:17:22,293 INFO L87 Difference]: Start difference. First operand 283 states and 285 transitions. Second operand has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:23,240 INFO L93 Difference]: Finished difference Result 300 states and 303 transitions. [2021-11-25 20:17:23,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 20:17:23,240 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 282 [2021-11-25 20:17:23,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:23,242 INFO L225 Difference]: With dead ends: 300 [2021-11-25 20:17:23,242 INFO L226 Difference]: Without dead ends: 298 [2021-11-25 20:17:23,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 877 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3830, Invalid=8380, Unknown=0, NotChecked=0, Total=12210 [2021-11-25 20:17:23,243 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 300 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:23,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 370 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:17:23,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-25 20:17:23,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 291. [2021-11-25 20:17:23,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2021-11-25 20:17:23,265 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 282 [2021-11-25 20:17:23,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:23,266 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2021-11-25 20:17:23,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:23,266 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2021-11-25 20:17:23,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-25 20:17:23,267 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:23,267 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:23,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:23,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-25 20:17:23,467 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:23,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:23,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1862693325, now seen corresponding path program 58 times [2021-11-25 20:17:23,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:23,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358997704] [2021-11-25 20:17:23,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:23,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:23,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:26,041 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4280 proven. 2300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:26,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:26,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358997704] [2021-11-25 20:17:26,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358997704] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:26,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274999654] [2021-11-25 20:17:26,041 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:17:26,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:26,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:26,042 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:26,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-25 20:17:26,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:26,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 1071 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-25 20:17:26,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:29,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:29,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:30,166 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:30,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274999654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:30,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526753759] [2021-11-25 20:17:30,167 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:30,167 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:30,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:30,167 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:30,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:30,279 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:31,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100521#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:31,053 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:31,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:31,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 96, 96] total 146 [2021-11-25 20:17:31,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129338096] [2021-11-25 20:17:31,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:31,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-25 20:17:31,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:31,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-25 20:17:31,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4878, Invalid=18992, Unknown=0, NotChecked=0, Total=23870 [2021-11-25 20:17:31,057 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:33,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:33,187 INFO L93 Difference]: Finished difference Result 627 states and 677 transitions. [2021-11-25 20:17:33,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 20:17:33,187 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 290 [2021-11-25 20:17:33,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:33,189 INFO L225 Difference]: With dead ends: 627 [2021-11-25 20:17:33,189 INFO L226 Difference]: Without dead ends: 434 [2021-11-25 20:17:33,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1012 GetRequests, 812 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9885 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=9392, Invalid=31210, Unknown=0, NotChecked=0, Total=40602 [2021-11-25 20:17:33,191 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 422 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 1620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:33,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 1186 Invalid, 1620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:17:33,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-25 20:17:33,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 293. [2021-11-25 20:17:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.0102739726027397) internal successors, (295), 292 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:33,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 295 transitions. [2021-11-25 20:17:33,214 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 295 transitions. Word has length 290 [2021-11-25 20:17:33,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:33,215 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 295 transitions. [2021-11-25 20:17:33,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:33,215 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 295 transitions. [2021-11-25 20:17:33,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-25 20:17:33,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:33,216 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:33,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:33,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:33,417 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:33,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:33,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1186482776, now seen corresponding path program 59 times [2021-11-25 20:17:33,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:33,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325153766] [2021-11-25 20:17:33,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:33,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:33,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:35,945 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4280 proven. 2394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:35,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:35,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325153766] [2021-11-25 20:17:35,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325153766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:35,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033865071] [2021-11-25 20:17:35,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:35,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:35,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:35,946 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:35,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 20:17:36,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2021-11-25 20:17:36,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:36,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 1081 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-25 20:17:36,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:39,893 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:39,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:40,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:40,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1033865071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:40,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2060473819] [2021-11-25 20:17:40,374 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:40,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:40,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:40,374 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:40,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:40,498 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:41,280 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103868#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:41,280 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:41,280 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:41,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 148 [2021-11-25 20:17:41,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874095352] [2021-11-25 20:17:41,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:41,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-25 20:17:41,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:41,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-25 20:17:41,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5027, Invalid=19465, Unknown=0, NotChecked=0, Total=24492 [2021-11-25 20:17:41,284 INFO L87 Difference]: Start difference. First operand 293 states and 295 transitions. Second operand has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:43,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:43,447 INFO L93 Difference]: Finished difference Result 634 states and 685 transitions. [2021-11-25 20:17:43,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-25 20:17:43,447 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 292 [2021-11-25 20:17:43,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:43,449 INFO L225 Difference]: With dead ends: 634 [2021-11-25 20:17:43,449 INFO L226 Difference]: Without dead ends: 439 [2021-11-25 20:17:43,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1020 GetRequests, 817 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10110 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=9733, Invalid=32087, Unknown=0, NotChecked=0, Total=41820 [2021-11-25 20:17:43,452 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 537 mSDsluCounter, 998 mSDsCounter, 0 mSdLazyCounter, 1151 mSolverCounterSat, 395 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 1096 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 395 IncrementalHoareTripleChecker+Valid, 1151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:43,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [537 Valid, 1096 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [395 Valid, 1151 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:17:43,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-11-25 20:17:43,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 295. [2021-11-25 20:17:43,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 1.010204081632653) internal successors, (297), 294 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:43,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 297 transitions. [2021-11-25 20:17:43,487 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 297 transitions. Word has length 292 [2021-11-25 20:17:43,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:43,487 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 297 transitions. [2021-11-25 20:17:43,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:43,488 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 297 transitions. [2021-11-25 20:17:43,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2021-11-25 20:17:43,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:43,490 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:43,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:43,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:43,717 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:43,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:43,717 INFO L85 PathProgramCache]: Analyzing trace with hash -2017947331, now seen corresponding path program 60 times [2021-11-25 20:17:43,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:43,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714979214] [2021-11-25 20:17:43,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:43,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:43,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:44,732 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2256 proven. 4514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:44,732 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:44,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714979214] [2021-11-25 20:17:44,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714979214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:44,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288837214] [2021-11-25 20:17:44,732 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:17:44,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:44,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:44,734 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:44,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 20:17:44,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:17:44,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:44,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 1091 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-25 20:17:44,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:45,371 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:45,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:45,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:45,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [288837214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:45,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283497564] [2021-11-25 20:17:45,841 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:45,841 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:45,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:45,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:45,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:45,947 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:46,364 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107149#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:46,365 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:46,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:46,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 54 [2021-11-25 20:17:46,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488332184] [2021-11-25 20:17:46,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:46,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-25 20:17:46,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:46,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-25 20:17:46,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=2654, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:17:46,367 INFO L87 Difference]: Start difference. First operand 295 states and 297 transitions. Second operand has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:47,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:47,382 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2021-11-25 20:17:47,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-25 20:17:47,383 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 294 [2021-11-25 20:17:47,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:47,384 INFO L225 Difference]: With dead ends: 312 [2021-11-25 20:17:47,384 INFO L226 Difference]: Without dead ends: 310 [2021-11-25 20:17:47,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1029 GetRequests, 915 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3616 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=4137, Invalid=8973, Unknown=0, NotChecked=0, Total=13110 [2021-11-25 20:17:47,385 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 212 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:47,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 452 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:17:47,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-25 20:17:47,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 303. [2021-11-25 20:17:47,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 1.009933774834437) internal successors, (305), 302 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:47,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 305 transitions. [2021-11-25 20:17:47,410 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 305 transitions. Word has length 294 [2021-11-25 20:17:47,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:47,410 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 305 transitions. [2021-11-25 20:17:47,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:47,410 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 305 transitions. [2021-11-25 20:17:47,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-25 20:17:47,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:47,411 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:47,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:47,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:47,613 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:47,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:47,613 INFO L85 PathProgramCache]: Analyzing trace with hash 280122915, now seen corresponding path program 61 times [2021-11-25 20:17:47,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:47,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291835496] [2021-11-25 20:17:47,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:47,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:47,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:50,270 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4658 proven. 2496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:50,270 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:50,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291835496] [2021-11-25 20:17:50,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291835496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:50,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614482370] [2021-11-25 20:17:50,270 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:17:50,270 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:50,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:50,271 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:50,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-25 20:17:50,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:50,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 1115 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 20:17:50,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:54,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:54,664 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:54,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614482370] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:54,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1564865260] [2021-11-25 20:17:54,665 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:17:54,665 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:54,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:54,667 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:54,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:54,809 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:55,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '110134#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:55,640 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:55,640 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:55,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 100, 100] total 152 [2021-11-25 20:17:55,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135145450] [2021-11-25 20:17:55,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:55,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-25 20:17:55,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:55,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-25 20:17:55,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5280, Invalid=20480, Unknown=0, NotChecked=0, Total=25760 [2021-11-25 20:17:55,645 INFO L87 Difference]: Start difference. First operand 303 states and 305 transitions. Second operand has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:57,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:57,923 INFO L93 Difference]: Finished difference Result 653 states and 705 transitions. [2021-11-25 20:17:57,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 20:17:57,923 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 302 [2021-11-25 20:17:57,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:57,925 INFO L225 Difference]: With dead ends: 653 [2021-11-25 20:17:57,925 INFO L226 Difference]: Without dead ends: 452 [2021-11-25 20:17:57,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1054 GetRequests, 846 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10648 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=10182, Invalid=33708, Unknown=0, NotChecked=0, Total=43890 [2021-11-25 20:17:57,928 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 525 mSDsluCounter, 1135 mSDsCounter, 0 mSdLazyCounter, 1285 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 1235 SdHoareTripleChecker+Invalid, 1678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 1285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:57,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [525 Valid, 1235 Invalid, 1678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 1285 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:17:57,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-25 20:17:57,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 305. [2021-11-25 20:17:57,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0098684210526316) internal successors, (307), 304 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:57,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 307 transitions. [2021-11-25 20:17:57,970 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 307 transitions. Word has length 302 [2021-11-25 20:17:57,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:57,970 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 307 transitions. [2021-11-25 20:17:57,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:57,970 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 307 transitions. [2021-11-25 20:17:57,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-25 20:17:57,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:57,972 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:58,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:58,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-25 20:17:58,189 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:58,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:58,189 INFO L85 PathProgramCache]: Analyzing trace with hash -886635832, now seen corresponding path program 62 times [2021-11-25 20:17:58,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:58,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661580029] [2021-11-25 20:17:58,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:58,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:58,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:00,899 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4658 proven. 2594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:00,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:00,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661580029] [2021-11-25 20:18:00,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661580029] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:00,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878283747] [2021-11-25 20:18:00,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:18:00,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:00,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:00,901 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:00,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 20:18:01,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2021-11-25 20:18:01,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:01,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-25 20:18:01,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:05,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:05,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:05,522 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:05,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878283747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:05,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354915453] [2021-11-25 20:18:05,524 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:05,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:05,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:05,524 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:05,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:05,648 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:06,452 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '113619#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:06,453 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:06,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:06,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 154 [2021-11-25 20:18:06,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798689885] [2021-11-25 20:18:06,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:06,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-25 20:18:06,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:06,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-25 20:18:06,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5435, Invalid=20971, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 20:18:06,458 INFO L87 Difference]: Start difference. First operand 305 states and 307 transitions. Second operand has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:08,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:08,937 INFO L93 Difference]: Finished difference Result 660 states and 713 transitions. [2021-11-25 20:18:08,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-25 20:18:08,937 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 304 [2021-11-25 20:18:08,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:08,939 INFO L225 Difference]: With dead ends: 660 [2021-11-25 20:18:08,939 INFO L226 Difference]: Without dead ends: 457 [2021-11-25 20:18:08,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 851 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10881 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=10537, Invalid=34619, Unknown=0, NotChecked=0, Total=45156 [2021-11-25 20:18:08,941 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 523 mSDsluCounter, 1125 mSDsCounter, 0 mSdLazyCounter, 1292 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 1227 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 1292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:08,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [523 Valid, 1227 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [546 Valid, 1292 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:18:08,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-25 20:18:08,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 307. [2021-11-25 20:18:08,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.0098039215686274) internal successors, (309), 306 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:08,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 309 transitions. [2021-11-25 20:18:08,971 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 309 transitions. Word has length 304 [2021-11-25 20:18:08,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:08,971 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 309 transitions. [2021-11-25 20:18:08,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:08,972 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 309 transitions. [2021-11-25 20:18:08,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-25 20:18:08,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:08,973 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:08,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:09,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-25 20:18:09,177 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:09,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:09,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1155327443, now seen corresponding path program 63 times [2021-11-25 20:18:09,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:09,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063596344] [2021-11-25 20:18:09,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:09,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:09,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:10,276 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2450 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:10,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:10,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063596344] [2021-11-25 20:18:10,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063596344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:10,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030003378] [2021-11-25 20:18:10,278 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:18:10,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:10,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:10,279 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:10,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 20:18:10,426 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:18:10,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:10,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 1135 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-25 20:18:10,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:10,990 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:10,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:11,498 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:11,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030003378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:11,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310541660] [2021-11-25 20:18:11,499 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:11,499 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:11,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:11,499 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:11,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:11,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:12,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '117034#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:12,050 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:12,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:12,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 56 [2021-11-25 20:18:12,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993909766] [2021-11-25 20:18:12,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:12,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-25 20:18:12,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:12,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-25 20:18:12,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=2807, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:18:12,052 INFO L87 Difference]: Start difference. First operand 307 states and 309 transitions. Second operand has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:13,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:13,119 INFO L93 Difference]: Finished difference Result 324 states and 327 transitions. [2021-11-25 20:18:13,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-25 20:18:13,119 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-25 20:18:13,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:13,121 INFO L225 Difference]: With dead ends: 324 [2021-11-25 20:18:13,121 INFO L226 Difference]: Without dead ends: 322 [2021-11-25 20:18:13,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1071 GetRequests, 953 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3864 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4456, Invalid=9586, Unknown=0, NotChecked=0, Total=14042 [2021-11-25 20:18:13,122 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 219 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:13,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 449 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:18:13,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-25 20:18:13,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 315. [2021-11-25 20:18:13,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 1.0095541401273886) internal successors, (317), 314 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:13,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 317 transitions. [2021-11-25 20:18:13,149 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 317 transitions. Word has length 306 [2021-11-25 20:18:13,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:13,149 INFO L470 AbstractCegarLoop]: Abstraction has 315 states and 317 transitions. [2021-11-25 20:18:13,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:13,150 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 317 transitions. [2021-11-25 20:18:13,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-25 20:18:13,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:13,151 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:13,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:13,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:13,369 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:13,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:13,369 INFO L85 PathProgramCache]: Analyzing trace with hash -1791168749, now seen corresponding path program 64 times [2021-11-25 20:18:13,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:13,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596651422] [2021-11-25 20:18:13,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:13,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:13,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:16,226 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5052 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:16,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:16,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596651422] [2021-11-25 20:18:16,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596651422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:16,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680409012] [2021-11-25 20:18:16,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:18:16,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:16,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:16,228 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:16,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-25 20:18:16,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:16,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-25 20:18:16,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:20,414 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:18:20,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:20,922 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:18:20,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680409012] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:20,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2135285835] [2021-11-25 20:18:20,924 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:20,924 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:20,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:20,924 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:20,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:21,057 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:21,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120137#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:21,882 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:21,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:21,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 104, 104] total 158 [2021-11-25 20:18:21,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335747956] [2021-11-25 20:18:21,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:21,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2021-11-25 20:18:21,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:21,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-11-25 20:18:21,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5698, Invalid=22024, Unknown=0, NotChecked=0, Total=27722 [2021-11-25 20:18:21,885 INFO L87 Difference]: Start difference. First operand 315 states and 317 transitions. Second operand has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:24,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:24,342 INFO L93 Difference]: Finished difference Result 679 states and 733 transitions. [2021-11-25 20:18:24,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-25 20:18:24,343 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 314 [2021-11-25 20:18:24,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:24,344 INFO L225 Difference]: With dead ends: 679 [2021-11-25 20:18:24,344 INFO L226 Difference]: Without dead ends: 470 [2021-11-25 20:18:24,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1096 GetRequests, 880 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11439 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=11004, Invalid=36302, Unknown=0, NotChecked=0, Total=47306 [2021-11-25 20:18:24,351 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 532 mSDsluCounter, 1169 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 348 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 1273 SdHoareTripleChecker+Invalid, 1685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 348 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:24,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [532 Valid, 1273 Invalid, 1685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [348 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:18:24,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-11-25 20:18:24,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 317. [2021-11-25 20:18:24,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.009493670886076) internal successors, (319), 316 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:24,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 319 transitions. [2021-11-25 20:18:24,380 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 319 transitions. Word has length 314 [2021-11-25 20:18:24,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:24,381 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 319 transitions. [2021-11-25 20:18:24,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:24,381 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 319 transitions. [2021-11-25 20:18:24,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-11-25 20:18:24,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:24,383 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:24,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:24,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:24,583 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:24,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:24,584 INFO L85 PathProgramCache]: Analyzing trace with hash 75680824, now seen corresponding path program 65 times [2021-11-25 20:18:24,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:24,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079447466] [2021-11-25 20:18:24,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:24,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:24,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:27,517 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5052 proven. 2802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:27,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:27,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079447466] [2021-11-25 20:18:27,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079447466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:27,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358142655] [2021-11-25 20:18:27,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:18:27,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:27,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:27,518 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:27,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 20:18:27,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-25 20:18:27,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:27,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-25 20:18:27,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:31,946 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:31,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:32,486 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:32,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358142655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:32,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626567273] [2021-11-25 20:18:32,488 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:32,488 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:32,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:32,488 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:32,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:32,608 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:33,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123760#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:33,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:33,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:33,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 160 [2021-11-25 20:18:33,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888460290] [2021-11-25 20:18:33,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:33,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2021-11-25 20:18:33,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:33,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2021-11-25 20:18:33,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5859, Invalid=22533, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 20:18:33,443 INFO L87 Difference]: Start difference. First operand 317 states and 319 transitions. Second operand has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:36,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:36,060 INFO L93 Difference]: Finished difference Result 686 states and 741 transitions. [2021-11-25 20:18:36,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-25 20:18:36,061 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 316 [2021-11-25 20:18:36,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:36,063 INFO L225 Difference]: With dead ends: 686 [2021-11-25 20:18:36,063 INFO L226 Difference]: Without dead ends: 475 [2021-11-25 20:18:36,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1104 GetRequests, 885 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11680 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=11373, Invalid=37247, Unknown=0, NotChecked=0, Total=48620 [2021-11-25 20:18:36,067 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 607 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 1280 mSolverCounterSat, 545 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 1223 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 545 IncrementalHoareTripleChecker+Valid, 1280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:36,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [607 Valid, 1223 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [545 Valid, 1280 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:18:36,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-25 20:18:36,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 319. [2021-11-25 20:18:36,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.009433962264151) internal successors, (321), 318 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:36,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 321 transitions. [2021-11-25 20:18:36,102 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 321 transitions. Word has length 316 [2021-11-25 20:18:36,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:36,102 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 321 transitions. [2021-11-25 20:18:36,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:36,103 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 321 transitions. [2021-11-25 20:18:36,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2021-11-25 20:18:36,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:36,104 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:36,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:36,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-25 20:18:36,309 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:36,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:36,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1178209251, now seen corresponding path program 66 times [2021-11-25 20:18:36,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:36,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919125323] [2021-11-25 20:18:36,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:36,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:36,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:37,520 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2652 proven. 5306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:37,520 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:37,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919125323] [2021-11-25 20:18:37,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919125323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:37,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871763422] [2021-11-25 20:18:37,520 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:18:37,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:37,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:37,521 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:37,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-25 20:18:37,690 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:18:37,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:37,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 1179 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 20:18:37,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:38,222 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:38,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:38,729 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:38,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871763422] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:38,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417089689] [2021-11-25 20:18:38,730 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:38,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:38,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:38,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:38,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:38,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:39,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '127309#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:39,277 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:39,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:39,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 58 [2021-11-25 20:18:39,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918091049] [2021-11-25 20:18:39,278 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:39,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-25 20:18:39,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:39,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-25 20:18:39,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1592, Invalid=2964, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 20:18:39,279 INFO L87 Difference]: Start difference. First operand 319 states and 321 transitions. Second operand has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:40,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:40,437 INFO L93 Difference]: Finished difference Result 336 states and 339 transitions. [2021-11-25 20:18:40,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-25 20:18:40,438 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 318 [2021-11-25 20:18:40,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:40,439 INFO L225 Difference]: With dead ends: 336 [2021-11-25 20:18:40,439 INFO L226 Difference]: Without dead ends: 334 [2021-11-25 20:18:40,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1113 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4787, Invalid=10219, Unknown=0, NotChecked=0, Total=15006 [2021-11-25 20:18:40,440 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 279 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 485 SdHoareTripleChecker+Invalid, 783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:40,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 485 Invalid, 783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:18:40,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-25 20:18:40,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 327. [2021-11-25 20:18:40,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 1.00920245398773) internal successors, (329), 326 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:40,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2021-11-25 20:18:40,469 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 318 [2021-11-25 20:18:40,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:40,469 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2021-11-25 20:18:40,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:40,469 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2021-11-25 20:18:40,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-25 20:18:40,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:40,470 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:40,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:40,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-25 20:18:40,671 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:40,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:40,671 INFO L85 PathProgramCache]: Analyzing trace with hash -736175869, now seen corresponding path program 67 times [2021-11-25 20:18:40,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:40,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252756656] [2021-11-25 20:18:40,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:40,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:40,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:43,768 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5462 proven. 2912 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:43,768 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:43,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252756656] [2021-11-25 20:18:43,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252756656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:43,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535992779] [2021-11-25 20:18:43,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:18:43,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:43,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:43,769 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:43,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-25 20:18:43,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:43,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 1203 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-25 20:18:43,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:48,241 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:18:48,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:48,789 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:18:48,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535992779] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:18:48,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672270780] [2021-11-25 20:18:48,790 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:18:48,790 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:48,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:48,791 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:48,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:48,906 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:49,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130530#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:18:49,754 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:18:49,754 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:49,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 108, 108] total 164 [2021-11-25 20:18:49,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610289575] [2021-11-25 20:18:49,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:49,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2021-11-25 20:18:49,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:18:49,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-11-25 20:18:49,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6132, Invalid=23624, Unknown=0, NotChecked=0, Total=29756 [2021-11-25 20:18:49,758 INFO L87 Difference]: Start difference. First operand 327 states and 329 transitions. Second operand has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:52,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:52,458 INFO L93 Difference]: Finished difference Result 705 states and 761 transitions. [2021-11-25 20:18:52,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-25 20:18:52,458 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 326 [2021-11-25 20:18:52,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:52,460 INFO L225 Difference]: With dead ends: 705 [2021-11-25 20:18:52,460 INFO L226 Difference]: Without dead ends: 488 [2021-11-25 20:18:52,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1138 GetRequests, 914 SyntacticMatches, 0 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12258 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=11858, Invalid=38992, Unknown=0, NotChecked=0, Total=50850 [2021-11-25 20:18:52,462 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 575 mSDsluCounter, 1106 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 641 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 1915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 641 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:52,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [575 Valid, 1214 Invalid, 1915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [641 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:18:52,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-25 20:18:52,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 329. [2021-11-25 20:18:52,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 1.0091463414634145) internal successors, (331), 328 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:52,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 331 transitions. [2021-11-25 20:18:52,491 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 331 transitions. Word has length 326 [2021-11-25 20:18:52,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:52,492 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 331 transitions. [2021-11-25 20:18:52,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:18:52,492 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 331 transitions. [2021-11-25 20:18:52,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-25 20:18:52,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:52,493 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:52,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:52,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-25 20:18:52,694 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:52,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:52,694 INFO L85 PathProgramCache]: Analyzing trace with hash 426845864, now seen corresponding path program 68 times [2021-11-25 20:18:52,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:52,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67439879] [2021-11-25 20:18:52,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:52,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:52,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:18:55,835 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 5462 proven. 3018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:55,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:55,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67439879] [2021-11-25 20:18:55,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67439879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:55,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679538100] [2021-11-25 20:18:55,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:18:55,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:55,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:55,838 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:55,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 20:18:56,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2021-11-25 20:18:56,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:56,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 1213 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-25 20:18:56,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:59,471 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:18:59,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:00,024 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:00,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679538100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:00,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122950078] [2021-11-25 20:19:00,025 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:19:00,025 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:00,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:00,026 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:00,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:00,164 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:01,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134290#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:01,021 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:01,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:01,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [110, 56, 56] total 165 [2021-11-25 20:19:01,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137266546] [2021-11-25 20:19:01,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:01,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2021-11-25 20:19:01,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:01,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2021-11-25 20:19:01,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4708, Invalid=25394, Unknown=0, NotChecked=0, Total=30102 [2021-11-25 20:19:01,024 INFO L87 Difference]: Start difference. First operand 329 states and 331 transitions. Second operand has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:08,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:08,861 INFO L93 Difference]: Finished difference Result 719 states and 777 transitions. [2021-11-25 20:19:08,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 221 states. [2021-11-25 20:19:08,862 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 328 [2021-11-25 20:19:08,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:08,864 INFO L225 Difference]: With dead ends: 719 [2021-11-25 20:19:08,864 INFO L226 Difference]: Without dead ends: 500 [2021-11-25 20:19:08,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1362 GetRequests, 973 SyntacticMatches, 1 SemanticMatches, 388 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52819 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=23071, Invalid=128639, Unknown=0, NotChecked=0, Total=151710 [2021-11-25 20:19:08,870 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 1064 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 3889 mSolverCounterSat, 1025 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1064 SdHoareTripleChecker+Valid, 886 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1025 IncrementalHoareTripleChecker+Valid, 3889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:08,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1064 Valid, 886 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1025 Valid, 3889 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 20:19:08,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2021-11-25 20:19:08,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 335. [2021-11-25 20:19:08,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:08,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2021-11-25 20:19:08,901 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 328 [2021-11-25 20:19:08,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:08,901 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2021-11-25 20:19:08,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:08,902 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2021-11-25 20:19:08,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2021-11-25 20:19:08,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:08,903 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:08,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:09,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:09,104 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:19:09,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:09,104 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 69 times [2021-11-25 20:19:09,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:19:09,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437928908] [2021-11-25 20:19:09,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:19:09,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:19:09,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:12,401 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:12,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:19:12,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437928908] [2021-11-25 20:19:12,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437928908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:12,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162990496] [2021-11-25 20:19:12,402 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:19:12,402 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:12,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:12,403 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:12,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-25 20:19:12,557 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:19:12,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:12,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-25 20:19:12,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:16,069 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:16,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:16,626 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:16,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162990496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:16,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1783660353] [2021-11-25 20:19:16,627 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:19:16,627 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:16,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:16,627 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:16,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:16,761 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:17,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138499#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:17,633 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:17,633 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:17,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 57, 57] total 168 [2021-11-25 20:19:17,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027526702] [2021-11-25 20:19:17,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:17,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2021-11-25 20:19:17,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:17,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2021-11-25 20:19:17,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4877, Invalid=26275, Unknown=0, NotChecked=0, Total=31152 [2021-11-25 20:19:17,637 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:25,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:25,606 INFO L93 Difference]: Finished difference Result 732 states and 791 transitions. [2021-11-25 20:19:25,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 225 states. [2021-11-25 20:19:25,607 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 334 [2021-11-25 20:19:25,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:25,609 INFO L225 Difference]: With dead ends: 732 [2021-11-25 20:19:25,609 INFO L226 Difference]: Without dead ends: 509 [2021-11-25 20:19:25,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 395 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54760 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=23910, Invalid=133302, Unknown=0, NotChecked=0, Total=157212 [2021-11-25 20:19:25,617 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 1142 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 3461 mSolverCounterSat, 1254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1142 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 4715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1254 IncrementalHoareTripleChecker+Valid, 3461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:25,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1142 Valid, 777 Invalid, 4715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1254 Valid, 3461 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-25 20:19:25,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-25 20:19:25,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 341. [2021-11-25 20:19:25,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.0088235294117647) internal successors, (343), 340 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:25,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 343 transitions. [2021-11-25 20:19:25,648 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 343 transitions. Word has length 334 [2021-11-25 20:19:25,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:25,648 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 343 transitions. [2021-11-25 20:19:25,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:25,649 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 343 transitions. [2021-11-25 20:19:25,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2021-11-25 20:19:25,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:25,650 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:25,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:25,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:25,850 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:19:25,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:25,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1029149208, now seen corresponding path program 70 times [2021-11-25 20:19:25,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:19:25,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241933657] [2021-11-25 20:19:25,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:19:25,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:19:25,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:29,252 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 5888 proven. 3242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:29,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:19:29,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241933657] [2021-11-25 20:19:29,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241933657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:29,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005858887] [2021-11-25 20:19:29,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:19:29,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:29,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:29,253 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:29,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-25 20:19:29,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:29,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 1257 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-25 20:19:29,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:34,223 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:34,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:34,783 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:34,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005858887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:34,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884329333] [2021-11-25 20:19:34,784 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:19:34,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:34,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:34,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:34,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:34,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:35,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '142785#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:35,808 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:35,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:35,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 172 [2021-11-25 20:19:35,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408910922] [2021-11-25 20:19:35,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:35,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-25 20:19:35,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:35,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-25 20:19:35,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6755, Invalid=25825, Unknown=0, NotChecked=0, Total=32580 [2021-11-25 20:19:35,814 INFO L87 Difference]: Start difference. First operand 341 states and 343 transitions. Second operand has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:38,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:38,815 INFO L93 Difference]: Finished difference Result 738 states and 797 transitions. [2021-11-25 20:19:38,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-25 20:19:38,816 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 340 [2021-11-25 20:19:38,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:38,818 INFO L225 Difference]: With dead ends: 738 [2021-11-25 20:19:38,818 INFO L226 Difference]: Without dead ends: 511 [2021-11-25 20:19:38,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1188 GetRequests, 953 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13362 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=13141, Invalid=42791, Unknown=0, NotChecked=0, Total=55932 [2021-11-25 20:19:38,821 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 599 mSDsluCounter, 1226 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 2070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 675 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:38,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 1340 Invalid, 2070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [675 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:19:38,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-25 20:19:38,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 343. [2021-11-25 20:19:38,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 342 states have (on average 1.0087719298245614) internal successors, (345), 342 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:38,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 345 transitions. [2021-11-25 20:19:38,853 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 345 transitions. Word has length 340 [2021-11-25 20:19:38,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:38,854 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 345 transitions. [2021-11-25 20:19:38,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:38,854 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 345 transitions. [2021-11-25 20:19:38,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2021-11-25 20:19:38,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:38,855 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:38,875 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:39,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:39,056 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:19:39,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:39,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1265984771, now seen corresponding path program 71 times [2021-11-25 20:19:39,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:19:39,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913116006] [2021-11-25 20:19:39,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:19:39,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:19:39,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3080 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:40,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:19:40,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913116006] [2021-11-25 20:19:40,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913116006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:40,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142813865] [2021-11-25 20:19:40,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:40,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:40,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:40,535 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:40,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-25 20:19:40,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2021-11-25 20:19:40,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:40,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 1267 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-25 20:19:40,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:41,378 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:41,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:41,927 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:41,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142813865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:41,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [175620820] [2021-11-25 20:19:41,928 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:19:41,928 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:41,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:41,928 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:41,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:42,066 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:42,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '146602#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:42,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:42,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:42,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 62 [2021-11-25 20:19:42,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697322874] [2021-11-25 20:19:42,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:42,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 20:19:42,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:42,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 20:19:42,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1822, Invalid=3290, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 20:19:42,524 INFO L87 Difference]: Start difference. First operand 343 states and 345 transitions. Second operand has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:43,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:43,821 INFO L93 Difference]: Finished difference Result 360 states and 363 transitions. [2021-11-25 20:19:43,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-25 20:19:43,821 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 342 [2021-11-25 20:19:43,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:43,822 INFO L225 Difference]: With dead ends: 360 [2021-11-25 20:19:43,823 INFO L226 Difference]: Without dead ends: 358 [2021-11-25 20:19:43,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1067 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5485, Invalid=11545, Unknown=0, NotChecked=0, Total=17030 [2021-11-25 20:19:43,824 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 243 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:43,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 512 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:19:43,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-25 20:19:43,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 351. [2021-11-25 20:19:43,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 350 states have (on average 1.0085714285714287) internal successors, (353), 350 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:43,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 353 transitions. [2021-11-25 20:19:43,856 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 353 transitions. Word has length 342 [2021-11-25 20:19:43,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:43,856 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 353 transitions. [2021-11-25 20:19:43,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:43,857 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 353 transitions. [2021-11-25 20:19:43,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-25 20:19:43,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:43,858 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:43,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:44,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:44,058 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:19:44,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:44,059 INFO L85 PathProgramCache]: Analyzing trace with hash -423714845, now seen corresponding path program 72 times [2021-11-25 20:19:44,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:19:44,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235251729] [2021-11-25 20:19:44,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:19:44,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:19:44,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:47,645 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6330 proven. 3360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:47,645 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:19:47,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235251729] [2021-11-25 20:19:47,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235251729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:47,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442068310] [2021-11-25 20:19:47,646 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:19:47,646 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:47,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:47,647 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:47,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-25 20:19:47,824 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:19:47,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:47,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 1291 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-25 20:19:47,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:52,884 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:52,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:53,588 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:19:53,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442068310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:53,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1950611202] [2021-11-25 20:19:53,589 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:19:53,589 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:53,589 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:53,590 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:53,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:53,705 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:19:54,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '150062#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:19:54,615 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:54,615 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:19:54,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 179 [2021-11-25 20:19:54,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324327113] [2021-11-25 20:19:54,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:54,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2021-11-25 20:19:54,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:54,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2021-11-25 20:19:54,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7346, Invalid=27810, Unknown=0, NotChecked=0, Total=35156 [2021-11-25 20:19:54,619 INFO L87 Difference]: Start difference. First operand 351 states and 353 transitions. Second operand has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:59,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:59,914 INFO L93 Difference]: Finished difference Result 991 states and 1053 transitions. [2021-11-25 20:19:59,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-11-25 20:19:59,914 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 350 [2021-11-25 20:19:59,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:59,916 INFO L225 Difference]: With dead ends: 991 [2021-11-25 20:19:59,916 INFO L226 Difference]: Without dead ends: 529 [2021-11-25 20:19:59,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1280 GetRequests, 979 SyntacticMatches, 0 SemanticMatches, 301 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23196 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=20975, Invalid=70531, Unknown=0, NotChecked=0, Total=91506 [2021-11-25 20:19:59,921 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 758 mSDsluCounter, 1665 mSDsCounter, 0 mSdLazyCounter, 1843 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 758 SdHoareTripleChecker+Valid, 1781 SdHoareTripleChecker+Invalid, 2345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 1843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:59,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [758 Valid, 1781 Invalid, 2345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 1843 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:19:59,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-11-25 20:19:59,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 355. [2021-11-25 20:19:59,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 1.0084745762711864) internal successors, (357), 354 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:59,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 357 transitions. [2021-11-25 20:19:59,954 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 357 transitions. Word has length 350 [2021-11-25 20:19:59,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:59,955 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 357 transitions. [2021-11-25 20:19:59,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:19:59,955 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 357 transitions. [2021-11-25 20:19:59,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-25 20:19:59,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:59,956 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:59,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:00,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-25 20:20:00,165 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:00,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:00,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1182230509, now seen corresponding path program 73 times [2021-11-25 20:20:00,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:00,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499656543] [2021-11-25 20:20:00,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:00,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:00,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:01,592 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3306 proven. 6614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:01,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:01,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499656543] [2021-11-25 20:20:01,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499656543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:01,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762345069] [2021-11-25 20:20:01,593 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:20:01,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:01,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:01,593 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:01,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-25 20:20:01,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:01,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 1311 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-25 20:20:01,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:02,359 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:02,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:02,924 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:02,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762345069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:02,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620661665] [2021-11-25 20:20:02,925 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:20:02,925 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:02,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:02,926 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:02,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:03,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:03,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '154467#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:03,504 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:03,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:03,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 64 [2021-11-25 20:20:03,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775361482] [2021-11-25 20:20:03,504 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:03,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-25 20:20:03,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:03,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-25 20:20:03,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1943, Invalid=3459, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 20:20:03,506 INFO L87 Difference]: Start difference. First operand 355 states and 357 transitions. Second operand has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:04,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:04,835 INFO L93 Difference]: Finished difference Result 372 states and 375 transitions. [2021-11-25 20:20:04,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-25 20:20:04,835 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 354 [2021-11-25 20:20:04,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:04,837 INFO L225 Difference]: With dead ends: 372 [2021-11-25 20:20:04,837 INFO L226 Difference]: Without dead ends: 370 [2021-11-25 20:20:04,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1239 GetRequests, 1105 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4936 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5852, Invalid=12238, Unknown=0, NotChecked=0, Total=18090 [2021-11-25 20:20:04,838 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 373 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:04,838 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 457 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:20:04,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-25 20:20:04,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 363. [2021-11-25 20:20:04,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 362 states have (on average 1.0082872928176796) internal successors, (365), 362 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:04,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 365 transitions. [2021-11-25 20:20:04,873 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 365 transitions. Word has length 354 [2021-11-25 20:20:04,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:04,873 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 365 transitions. [2021-11-25 20:20:04,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:04,873 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 365 transitions. [2021-11-25 20:20:04,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-25 20:20:04,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:04,875 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:04,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:05,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2021-11-25 20:20:05,076 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:05,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:05,076 INFO L85 PathProgramCache]: Analyzing trace with hash 1430748371, now seen corresponding path program 74 times [2021-11-25 20:20:05,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:05,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418925212] [2021-11-25 20:20:05,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:05,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:05,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:08,873 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6788 proven. 3596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:08,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:08,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418925212] [2021-11-25 20:20:08,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418925212] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:08,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462228005] [2021-11-25 20:20:08,874 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:20:08,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:08,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:08,875 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:08,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-25 20:20:09,191 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2021-11-25 20:20:09,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:09,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 1335 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-25 20:20:09,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:14,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:14,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:15,341 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:15,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462228005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:15,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [307453628] [2021-11-25 20:20:15,342 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:20:15,342 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:15,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:15,342 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:15,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:15,448 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:16,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158045#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:16,383 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:16,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:16,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 185 [2021-11-25 20:20:16,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177470459] [2021-11-25 20:20:16,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:16,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 185 states [2021-11-25 20:20:16,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:16,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2021-11-25 20:20:16,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7838, Invalid=29604, Unknown=0, NotChecked=0, Total=37442 [2021-11-25 20:20:16,388 INFO L87 Difference]: Start difference. First operand 363 states and 365 transitions. Second operand has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:21,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:21,936 INFO L93 Difference]: Finished difference Result 1025 states and 1089 transitions. [2021-11-25 20:20:21,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2021-11-25 20:20:21,936 INFO L78 Accepts]: Start accepts. Automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 362 [2021-11-25 20:20:21,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:21,938 INFO L225 Difference]: With dead ends: 1025 [2021-11-25 20:20:21,938 INFO L226 Difference]: Without dead ends: 547 [2021-11-25 20:20:21,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1324 GetRequests, 1013 SyntacticMatches, 0 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24716 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=22417, Invalid=75239, Unknown=0, NotChecked=0, Total=97656 [2021-11-25 20:20:21,944 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 766 mSDsluCounter, 1587 mSDsCounter, 0 mSdLazyCounter, 1779 mSolverCounterSat, 572 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 1707 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 572 IncrementalHoareTripleChecker+Valid, 1779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:21,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 1707 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [572 Valid, 1779 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:20:21,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-11-25 20:20:21,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 367. [2021-11-25 20:20:21,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 366 states have (on average 1.0081967213114753) internal successors, (369), 366 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:21,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 369 transitions. [2021-11-25 20:20:21,980 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 369 transitions. Word has length 362 [2021-11-25 20:20:21,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:21,980 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 369 transitions. [2021-11-25 20:20:21,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:21,981 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 369 transitions. [2021-11-25 20:20:21,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2021-11-25 20:20:21,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:21,982 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 59, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:22,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:22,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:22,182 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:22,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:22,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1892514339, now seen corresponding path program 75 times [2021-11-25 20:20:22,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:22,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234103999] [2021-11-25 20:20:22,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:22,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:22,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:23,768 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3540 proven. 7082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:23,769 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:23,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234103999] [2021-11-25 20:20:23,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234103999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:23,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508953125] [2021-11-25 20:20:23,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:20:23,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:23,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:23,770 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:23,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-25 20:20:23,940 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:20:23,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:23,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-25 20:20:23,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:24,523 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:24,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:25,116 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:25,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508953125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:25,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [949852039] [2021-11-25 20:20:25,117 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:20:25,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:25,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:25,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:25,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:25,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:25,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '162600#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:25,700 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:25,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:25,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 66 [2021-11-25 20:20:25,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201087881] [2021-11-25 20:20:25,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:25,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-25 20:20:25,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:25,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-25 20:20:25,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2068, Invalid=3632, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 20:20:25,702 INFO L87 Difference]: Start difference. First operand 367 states and 369 transitions. Second operand has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:27,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:27,115 INFO L93 Difference]: Finished difference Result 384 states and 387 transitions. [2021-11-25 20:20:27,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-25 20:20:27,116 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 366 [2021-11-25 20:20:27,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:27,118 INFO L225 Difference]: With dead ends: 384 [2021-11-25 20:20:27,118 INFO L226 Difference]: Without dead ends: 382 [2021-11-25 20:20:27,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1281 GetRequests, 1143 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5224 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6231, Invalid=12951, Unknown=0, NotChecked=0, Total=19182 [2021-11-25 20:20:27,120 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 383 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:27,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 503 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:20:27,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-11-25 20:20:27,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 375. [2021-11-25 20:20:27,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 374 states have (on average 1.0080213903743316) internal successors, (377), 374 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:27,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 377 transitions. [2021-11-25 20:20:27,156 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 377 transitions. Word has length 366 [2021-11-25 20:20:27,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:27,157 INFO L470 AbstractCegarLoop]: Abstraction has 375 states and 377 transitions. [2021-11-25 20:20:27,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:27,157 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 377 transitions. [2021-11-25 20:20:27,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2021-11-25 20:20:27,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:27,160 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 61, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:27,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:27,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:27,369 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:27,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:27,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1941809859, now seen corresponding path program 76 times [2021-11-25 20:20:27,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:27,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008001737] [2021-11-25 20:20:27,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:27,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:27,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:31,392 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7262 proven. 3840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:31,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:31,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008001737] [2021-11-25 20:20:31,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008001737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:31,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240526940] [2021-11-25 20:20:31,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:20:31,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:31,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:31,394 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:31,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-25 20:20:31,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:31,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-25 20:20:31,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:37,161 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:20:37,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:37,769 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:20:37,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240526940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:37,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [118456047] [2021-11-25 20:20:37,770 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:20:37,770 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:37,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:37,771 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:37,771 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:37,877 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:38,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166293#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:38,872 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:38,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:38,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 124, 124] total 188 [2021-11-25 20:20:38,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819605039] [2021-11-25 20:20:38,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:38,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2021-11-25 20:20:38,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:38,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-11-25 20:20:38,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8028, Invalid=30584, Unknown=0, NotChecked=0, Total=38612 [2021-11-25 20:20:38,877 INFO L87 Difference]: Start difference. First operand 375 states and 377 transitions. Second operand has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:42,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:42,451 INFO L93 Difference]: Finished difference Result 809 states and 873 transitions. [2021-11-25 20:20:42,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-25 20:20:42,451 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 374 [2021-11-25 20:20:42,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:42,453 INFO L225 Difference]: With dead ends: 809 [2021-11-25 20:20:42,453 INFO L226 Difference]: Without dead ends: 560 [2021-11-25 20:20:42,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1306 GetRequests, 1050 SyntacticMatches, 0 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15814 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=15594, Invalid=50712, Unknown=0, NotChecked=0, Total=66306 [2021-11-25 20:20:42,457 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 817 mSDsluCounter, 1335 mSDsCounter, 0 mSdLazyCounter, 1522 mSolverCounterSat, 631 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 817 SdHoareTripleChecker+Valid, 1459 SdHoareTripleChecker+Invalid, 2153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 631 IncrementalHoareTripleChecker+Valid, 1522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:42,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [817 Valid, 1459 Invalid, 2153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [631 Valid, 1522 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:20:42,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-11-25 20:20:42,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 377. [2021-11-25 20:20:42,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 376 states have (on average 1.0079787234042554) internal successors, (379), 376 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:42,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 379 transitions. [2021-11-25 20:20:42,495 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 379 transitions. Word has length 374 [2021-11-25 20:20:42,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:42,495 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 379 transitions. [2021-11-25 20:20:42,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:42,495 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 379 transitions. [2021-11-25 20:20:42,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2021-11-25 20:20:42,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:42,497 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:42,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:42,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-25 20:20:42,697 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:42,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:42,698 INFO L85 PathProgramCache]: Analyzing trace with hash 605174376, now seen corresponding path program 77 times [2021-11-25 20:20:42,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:42,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242615288] [2021-11-25 20:20:42,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:42,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:42,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:20:46,801 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7262 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:46,801 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:20:46,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242615288] [2021-11-25 20:20:46,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242615288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:46,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632844587] [2021-11-25 20:20:46,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:20:46,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:46,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:20:46,802 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:20:46,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-25 20:20:47,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-25 20:20:47,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:47,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1389 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-25 20:20:47,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:52,884 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:52,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:53,501 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:20:53,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632844587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:20:53,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107565996] [2021-11-25 20:20:53,502 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:20:53,502 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:20:53,502 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:20:53,502 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:20:53,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:20:53,614 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:54,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '170606#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:20:54,571 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:20:54,571 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:20:54,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 126, 126] total 190 [2021-11-25 20:20:54,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40465073] [2021-11-25 20:20:54,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:54,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-11-25 20:20:54,573 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:20:54,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-11-25 20:20:54,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8219, Invalid=31183, Unknown=0, NotChecked=0, Total=39402 [2021-11-25 20:20:54,576 INFO L87 Difference]: Start difference. First operand 377 states and 379 transitions. Second operand has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:58,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:58,275 INFO L93 Difference]: Finished difference Result 816 states and 881 transitions. [2021-11-25 20:20:58,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-25 20:20:58,275 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 376 [2021-11-25 20:20:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:58,277 INFO L225 Difference]: With dead ends: 816 [2021-11-25 20:20:58,277 INFO L226 Difference]: Without dead ends: 565 [2021-11-25 20:20:58,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1055 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16095 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=16033, Invalid=51827, Unknown=0, NotChecked=0, Total=67860 [2021-11-25 20:20:58,281 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 778 mSDsluCounter, 1357 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 551 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 778 SdHoareTripleChecker+Valid, 1483 SdHoareTripleChecker+Invalid, 2100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 551 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:58,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [778 Valid, 1483 Invalid, 2100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [551 Valid, 1549 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:20:58,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-11-25 20:20:58,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 379. [2021-11-25 20:20:58,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 378 states have (on average 1.007936507936508) internal successors, (381), 378 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:58,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2021-11-25 20:20:58,318 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 376 [2021-11-25 20:20:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:58,319 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2021-11-25 20:20:58,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:20:58,319 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2021-11-25 20:20:58,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2021-11-25 20:20:58,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:58,321 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:20:58,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:58,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-11-25 20:20:58,544 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:20:58,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:58,544 INFO L85 PathProgramCache]: Analyzing trace with hash 293696717, now seen corresponding path program 78 times [2021-11-25 20:20:58,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:20:58,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137375834] [2021-11-25 20:20:58,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:20:58,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:20:58,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:00,176 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3782 proven. 7566 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:00,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:00,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137375834] [2021-11-25 20:21:00,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137375834] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:00,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506539647] [2021-11-25 20:21:00,176 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:00,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:00,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:00,177 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:00,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-25 20:21:00,353 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:00,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:00,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 1399 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-25 20:21:00,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:00,961 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:00,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:01,574 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:01,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506539647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:01,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [266210815] [2021-11-25 20:21:01,575 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:21:01,576 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:01,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:01,576 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:01,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:01,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:02,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '174825#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:02,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:02,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:02,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 68 [2021-11-25 20:21:02,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822341685] [2021-11-25 20:21:02,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:02,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-25 20:21:02,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:02,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-25 20:21:02,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2197, Invalid=3809, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 20:21:02,194 INFO L87 Difference]: Start difference. First operand 379 states and 381 transitions. Second operand has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:03,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:03,726 INFO L93 Difference]: Finished difference Result 396 states and 399 transitions. [2021-11-25 20:21:03,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-25 20:21:03,727 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 378 [2021-11-25 20:21:03,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:03,728 INFO L225 Difference]: With dead ends: 396 [2021-11-25 20:21:03,728 INFO L226 Difference]: Without dead ends: 394 [2021-11-25 20:21:03,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1323 GetRequests, 1181 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=6622, Invalid=13684, Unknown=0, NotChecked=0, Total=20306 [2021-11-25 20:21:03,730 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 331 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:03,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 602 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:21:03,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-11-25 20:21:03,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 387. [2021-11-25 20:21:03,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0077720207253886) internal successors, (389), 386 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:03,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 389 transitions. [2021-11-25 20:21:03,769 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 389 transitions. Word has length 378 [2021-11-25 20:21:03,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:03,769 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 389 transitions. [2021-11-25 20:21:03,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:03,769 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 389 transitions. [2021-11-25 20:21:03,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-25 20:21:03,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:03,771 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 63, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:03,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:03,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:03,971 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:03,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:03,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1734781363, now seen corresponding path program 79 times [2021-11-25 20:21:03,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:03,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449618817] [2021-11-25 20:21:03,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:03,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:04,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:08,303 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7752 proven. 4092 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:08,303 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:08,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449618817] [2021-11-25 20:21:08,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449618817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:08,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639779057] [2021-11-25 20:21:08,304 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:21:08,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:08,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:08,305 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:08,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-25 20:21:08,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:08,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 1423 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-25 20:21:08,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:14,375 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:21:14,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:15,017 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:21:15,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639779057] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:15,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665882435] [2021-11-25 20:21:15,018 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:21:15,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:15,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:15,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:15,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:15,136 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:16,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '178636#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:16,133 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:16,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:16,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 128, 128] total 194 [2021-11-25 20:21:16,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234083122] [2021-11-25 20:21:16,134 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:16,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2021-11-25 20:21:16,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:16,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2021-11-25 20:21:16,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8542, Invalid=32464, Unknown=0, NotChecked=0, Total=41006 [2021-11-25 20:21:16,138 INFO L87 Difference]: Start difference. First operand 387 states and 389 transitions. Second operand has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:20,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:20,207 INFO L93 Difference]: Finished difference Result 835 states and 901 transitions. [2021-11-25 20:21:20,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-25 20:21:20,207 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 386 [2021-11-25 20:21:20,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:20,209 INFO L225 Difference]: With dead ends: 835 [2021-11-25 20:21:20,209 INFO L226 Difference]: Without dead ends: 578 [2021-11-25 20:21:20,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1348 GetRequests, 1084 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16773 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=16608, Invalid=53882, Unknown=0, NotChecked=0, Total=70490 [2021-11-25 20:21:20,214 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 692 mSDsluCounter, 1562 mSDsCounter, 0 mSdLazyCounter, 1768 mSolverCounterSat, 703 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 692 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 2471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 1768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:20,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [692 Valid, 1690 Invalid, 2471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 1768 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:21:20,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-11-25 20:21:20,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 389. [2021-11-25 20:21:20,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 1.0077319587628866) internal successors, (391), 388 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:20,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 391 transitions. [2021-11-25 20:21:20,255 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 391 transitions. Word has length 386 [2021-11-25 20:21:20,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:20,256 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 391 transitions. [2021-11-25 20:21:20,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:20,256 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 391 transitions. [2021-11-25 20:21:20,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-25 20:21:20,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:20,257 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:20,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:20,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:20,458 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:20,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:20,458 INFO L85 PathProgramCache]: Analyzing trace with hash 617605592, now seen corresponding path program 80 times [2021-11-25 20:21:20,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:20,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082905225] [2021-11-25 20:21:20,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:20,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:20,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:24,855 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7752 proven. 4218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:24,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:24,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082905225] [2021-11-25 20:21:24,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082905225] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:24,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77571192] [2021-11-25 20:21:24,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:21:24,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:24,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:24,856 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:24,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-25 20:21:25,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-25 20:21:25,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:25,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 1433 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-25 20:21:25,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:31,455 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:31,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:32,116 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:32,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77571192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:32,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [508834035] [2021-11-25 20:21:32,117 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:21:32,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:32,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:32,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:32,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:32,238 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:33,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '183087#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:33,225 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:33,225 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:33,225 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [130, 130, 130] total 196 [2021-11-25 20:21:33,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238993531] [2021-11-25 20:21:33,225 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:33,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2021-11-25 20:21:33,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:33,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2021-11-25 20:21:33,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8739, Invalid=33081, Unknown=0, NotChecked=0, Total=41820 [2021-11-25 20:21:33,230 INFO L87 Difference]: Start difference. First operand 389 states and 391 transitions. Second operand has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:37,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:37,333 INFO L93 Difference]: Finished difference Result 842 states and 909 transitions. [2021-11-25 20:21:37,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-25 20:21:37,333 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 388 [2021-11-25 20:21:37,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:37,335 INFO L225 Difference]: With dead ends: 842 [2021-11-25 20:21:37,335 INFO L226 Difference]: Without dead ends: 583 [2021-11-25 20:21:37,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1356 GetRequests, 1089 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17062 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=17061, Invalid=55031, Unknown=0, NotChecked=0, Total=72092 [2021-11-25 20:21:37,339 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 775 mSDsluCounter, 1494 mSDsCounter, 0 mSdLazyCounter, 1694 mSolverCounterSat, 944 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 775 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 2638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 944 IncrementalHoareTripleChecker+Valid, 1694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:37,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [775 Valid, 1624 Invalid, 2638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [944 Valid, 1694 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:21:37,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-11-25 20:21:37,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 391. [2021-11-25 20:21:37,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 1.0076923076923077) internal successors, (393), 390 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:37,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 393 transitions. [2021-11-25 20:21:37,380 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 393 transitions. Word has length 388 [2021-11-25 20:21:37,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:37,380 INFO L470 AbstractCegarLoop]: Abstraction has 391 states and 393 transitions. [2021-11-25 20:21:37,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:37,380 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 393 transitions. [2021-11-25 20:21:37,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2021-11-25 20:21:37,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:37,382 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:37,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:37,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:37,585 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:37,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:37,585 INFO L85 PathProgramCache]: Analyzing trace with hash 753513661, now seen corresponding path program 81 times [2021-11-25 20:21:37,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:37,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574168247] [2021-11-25 20:21:37,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:37,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:37,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:39,303 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4032 proven. 8066 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:39,303 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:39,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574168247] [2021-11-25 20:21:39,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574168247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:39,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45402261] [2021-11-25 20:21:39,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:39,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:39,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:39,305 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:39,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-25 20:21:39,489 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:39,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:39,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-25 20:21:39,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:40,126 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:40,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:40,764 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:40,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45402261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:40,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698612814] [2021-11-25 20:21:40,765 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:21:40,766 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:40,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:40,766 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:40,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:40,936 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:41,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '187440#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:41,424 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:41,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:41,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 70 [2021-11-25 20:21:41,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220743594] [2021-11-25 20:21:41,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:41,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-25 20:21:41,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:41,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-25 20:21:41,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2330, Invalid=3990, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:21:41,426 INFO L87 Difference]: Start difference. First operand 391 states and 393 transitions. Second operand has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:43,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:43,008 INFO L93 Difference]: Finished difference Result 408 states and 411 transitions. [2021-11-25 20:21:43,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-25 20:21:43,009 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 390 [2021-11-25 20:21:43,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:43,010 INFO L225 Difference]: With dead ends: 408 [2021-11-25 20:21:43,010 INFO L226 Difference]: Without dead ends: 406 [2021-11-25 20:21:43,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1219 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5824 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=7025, Invalid=14437, Unknown=0, NotChecked=0, Total=21462 [2021-11-25 20:21:43,012 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 404 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:43,012 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [404 Valid, 541 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:21:43,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-25 20:21:43,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 399. [2021-11-25 20:21:43,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.0075376884422111) internal successors, (401), 398 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:43,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 401 transitions. [2021-11-25 20:21:43,063 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 401 transitions. Word has length 390 [2021-11-25 20:21:43,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:43,063 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 401 transitions. [2021-11-25 20:21:43,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:21:43,064 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 401 transitions. [2021-11-25 20:21:43,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2021-11-25 20:21:43,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:43,065 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 65, 64, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:43,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:43,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:43,266 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:43,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:43,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1917319587, now seen corresponding path program 82 times [2021-11-25 20:21:43,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:43,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533116549] [2021-11-25 20:21:43,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:43,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:43,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:47,830 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8258 proven. 4352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:21:47,830 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:47,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533116549] [2021-11-25 20:21:47,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533116549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:47,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825183636] [2021-11-25 20:21:47,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:21:47,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:47,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:47,831 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:47,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-25 20:21:48,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:21:48,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1467 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-25 20:21:48,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:54,279 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:21:54,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:54,932 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:21:54,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825183636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:21:54,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131402988] [2021-11-25 20:21:54,933 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:21:54,933 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:54,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:54,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:54,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:55,050 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:56,050 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191369#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:21:56,050 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:56,050 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:56,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 132, 132] total 200 [2021-11-25 20:21:56,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627082497] [2021-11-25 20:21:56,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:56,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 200 states [2021-11-25 20:21:56,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:56,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2021-11-25 20:21:56,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=34400, Unknown=0, NotChecked=0, Total=43472 [2021-11-25 20:21:56,055 INFO L87 Difference]: Start difference. First operand 399 states and 401 transitions. Second operand has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:00,215 INFO L93 Difference]: Finished difference Result 861 states and 929 transitions. [2021-11-25 20:22:00,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-25 20:22:00,215 INFO L78 Accepts]: Start accepts. Automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 398 [2021-11-25 20:22:00,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:00,217 INFO L225 Difference]: With dead ends: 861 [2021-11-25 20:22:00,217 INFO L226 Difference]: Without dead ends: 596 [2021-11-25 20:22:00,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1390 GetRequests, 1118 SyntacticMatches, 0 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17760 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=17654, Invalid=57148, Unknown=0, NotChecked=0, Total=74802 [2021-11-25 20:22:00,220 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 747 mSDsluCounter, 1409 mSDsCounter, 0 mSdLazyCounter, 1609 mSolverCounterSat, 807 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 747 SdHoareTripleChecker+Valid, 1541 SdHoareTripleChecker+Invalid, 2416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 807 IncrementalHoareTripleChecker+Valid, 1609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:00,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [747 Valid, 1541 Invalid, 2416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [807 Valid, 1609 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:22:00,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2021-11-25 20:22:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 401. [2021-11-25 20:22:00,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 1.0075) internal successors, (403), 400 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 403 transitions. [2021-11-25 20:22:00,271 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 403 transitions. Word has length 398 [2021-11-25 20:22:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:00,271 INFO L470 AbstractCegarLoop]: Abstraction has 401 states and 403 transitions. [2021-11-25 20:22:00,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:00,272 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 403 transitions. [2021-11-25 20:22:00,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2021-11-25 20:22:00,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:00,273 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:00,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:00,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:00,474 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:00,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:00,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1799280056, now seen corresponding path program 83 times [2021-11-25 20:22:00,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:00,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298791104] [2021-11-25 20:22:00,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:00,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:00,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:05,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8258 proven. 4482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:05,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:05,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298791104] [2021-11-25 20:22:05,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298791104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:05,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901533454] [2021-11-25 20:22:05,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:22:05,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:05,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:05,119 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:05,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-25 20:22:05,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2021-11-25 20:22:05,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:05,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 1477 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-25 20:22:05,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:11,899 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:11,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:12,567 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:12,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901533454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:12,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068558753] [2021-11-25 20:22:12,569 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:22:12,569 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:12,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:12,569 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:12,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:12,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:13,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '195958#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:13,782 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:13,782 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:13,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134, 134] total 202 [2021-11-25 20:22:13,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519868415] [2021-11-25 20:22:13,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:13,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2021-11-25 20:22:13,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:13,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2021-11-25 20:22:13,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9275, Invalid=35035, Unknown=0, NotChecked=0, Total=44310 [2021-11-25 20:22:13,788 INFO L87 Difference]: Start difference. First operand 401 states and 403 transitions. Second operand has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:18,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:18,104 INFO L93 Difference]: Finished difference Result 868 states and 937 transitions. [2021-11-25 20:22:18,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-25 20:22:18,104 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 400 [2021-11-25 20:22:18,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:18,107 INFO L225 Difference]: With dead ends: 868 [2021-11-25 20:22:18,107 INFO L226 Difference]: Without dead ends: 601 [2021-11-25 20:22:18,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1398 GetRequests, 1123 SyntacticMatches, 0 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18057 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=18121, Invalid=58331, Unknown=0, NotChecked=0, Total=76452 [2021-11-25 20:22:18,112 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 635 mSDsluCounter, 1709 mSDsCounter, 0 mSdLazyCounter, 1910 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 1843 SdHoareTripleChecker+Invalid, 2332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 1910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:18,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [635 Valid, 1843 Invalid, 2332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 1910 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:22:18,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-11-25 20:22:18,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 403. [2021-11-25 20:22:18,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 1.007462686567164) internal successors, (405), 402 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:18,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 405 transitions. [2021-11-25 20:22:18,193 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 405 transitions. Word has length 400 [2021-11-25 20:22:18,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:18,193 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 405 transitions. [2021-11-25 20:22:18,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:18,194 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 405 transitions. [2021-11-25 20:22:18,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2021-11-25 20:22:18,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:18,196 INFO L514 BasicCegarLoop]: trace histogram [67, 66, 66, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:18,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:18,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-11-25 20:22:18,396 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:18,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:18,396 INFO L85 PathProgramCache]: Analyzing trace with hash -38746707, now seen corresponding path program 84 times [2021-11-25 20:22:18,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:18,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625973730] [2021-11-25 20:22:18,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:18,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:18,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:20,208 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4290 proven. 8582 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:20,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625973730] [2021-11-25 20:22:20,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625973730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911036650] [2021-11-25 20:22:20,209 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:22:20,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:20,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:20,211 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:20,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-25 20:22:20,401 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:22:20,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:20,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 1487 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-25 20:22:20,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:21,049 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:21,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:21,709 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:21,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911036650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:21,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634745483] [2021-11-25 20:22:21,710 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:22:21,710 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:21,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:21,711 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:21,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:21,815 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:22,315 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '200445#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:22,315 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:22,315 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:22,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 72 [2021-11-25 20:22:22,316 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094007164] [2021-11-25 20:22:22,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:22,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 20:22:22,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:22,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 20:22:22,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2467, Invalid=4175, Unknown=0, NotChecked=0, Total=6642 [2021-11-25 20:22:22,318 INFO L87 Difference]: Start difference. First operand 403 states and 405 transitions. Second operand has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:24,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:24,005 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2021-11-25 20:22:24,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-11-25 20:22:24,005 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 402 [2021-11-25 20:22:24,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:24,007 INFO L225 Difference]: With dead ends: 420 [2021-11-25 20:22:24,007 INFO L226 Difference]: Without dead ends: 418 [2021-11-25 20:22:24,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1407 GetRequests, 1257 SyntacticMatches, 1 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6136 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7440, Invalid=15210, Unknown=0, NotChecked=0, Total=22650 [2021-11-25 20:22:24,008 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 357 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:24,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 596 Invalid, 978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:22:24,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-11-25 20:22:24,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 411. [2021-11-25 20:22:24,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 410 states have (on average 1.0073170731707317) internal successors, (413), 410 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:24,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 413 transitions. [2021-11-25 20:22:24,052 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 413 transitions. Word has length 402 [2021-11-25 20:22:24,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:24,052 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 413 transitions. [2021-11-25 20:22:24,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:24,052 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 413 transitions. [2021-11-25 20:22:24,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2021-11-25 20:22:24,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:24,054 INFO L514 BasicCegarLoop]: trace histogram [68, 67, 67, 67, 67, 66, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:24,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:24,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2021-11-25 20:22:24,255 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:24,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:24,255 INFO L85 PathProgramCache]: Analyzing trace with hash -752412013, now seen corresponding path program 85 times [2021-11-25 20:22:24,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:24,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769183959] [2021-11-25 20:22:24,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:24,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:24,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:29,090 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8780 proven. 4620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:29,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:29,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769183959] [2021-11-25 20:22:29,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769183959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:29,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172346660] [2021-11-25 20:22:29,091 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:22:29,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:29,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:29,097 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:29,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-25 20:22:29,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:29,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 1511 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-25 20:22:29,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:35,853 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8976 proven. 4422 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:22:35,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:36,554 INFO L134 CoverageAnalysis]: Checked inductivity of 13400 backedges. 8976 proven. 4422 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:22:36,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172346660] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:36,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1547347960] [2021-11-25 20:22:36,555 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:22:36,555 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:36,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:36,555 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:36,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:36,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:37,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '204492#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:37,683 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:37,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:37,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [137, 136, 136] total 206 [2021-11-25 20:22:37,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816737303] [2021-11-25 20:22:37,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:37,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 206 states [2021-11-25 20:22:37,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:37,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 206 interpolants. [2021-11-25 20:22:37,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9618, Invalid=36392, Unknown=0, NotChecked=0, Total=46010 [2021-11-25 20:22:37,689 INFO L87 Difference]: Start difference. First operand 411 states and 413 transitions. Second operand has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:42,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:42,251 INFO L93 Difference]: Finished difference Result 887 states and 957 transitions. [2021-11-25 20:22:42,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-25 20:22:42,251 INFO L78 Accepts]: Start accepts. Automaton has has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 410 [2021-11-25 20:22:42,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:42,254 INFO L225 Difference]: With dead ends: 887 [2021-11-25 20:22:42,254 INFO L226 Difference]: Without dead ends: 614 [2021-11-25 20:22:42,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1432 GetRequests, 1152 SyntacticMatches, 0 SemanticMatches, 280 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18775 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=18732, Invalid=60510, Unknown=0, NotChecked=0, Total=79242 [2021-11-25 20:22:42,258 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 654 mSDsluCounter, 1891 mSDsCounter, 0 mSdLazyCounter, 2105 mSolverCounterSat, 704 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 654 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 2809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 704 IncrementalHoareTripleChecker+Valid, 2105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:42,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [654 Valid, 2027 Invalid, 2809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [704 Valid, 2105 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:22:42,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-11-25 20:22:42,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 413. [2021-11-25 20:22:42,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 412 states have (on average 1.0072815533980584) internal successors, (415), 412 states have internal predecessors, (415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:42,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 415 transitions. [2021-11-25 20:22:42,303 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 415 transitions. Word has length 410 [2021-11-25 20:22:42,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:42,303 INFO L470 AbstractCegarLoop]: Abstraction has 413 states and 415 transitions. [2021-11-25 20:22:42,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 206 states, 206 states have (on average 3.3300970873786406) internal successors, (686), 206 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:22:42,303 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 415 transitions. [2021-11-25 20:22:42,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2021-11-25 20:22:42,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:42,305 INFO L514 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:42,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:42,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:42,505 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:42,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:42,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1405844408, now seen corresponding path program 86 times [2021-11-25 20:22:42,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:42,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243415191] [2021-11-25 20:22:42,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:42,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:42,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:22:47,418 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8780 proven. 4754 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:47,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:22:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243415191] [2021-11-25 20:22:47,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243415191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:47,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277403908] [2021-11-25 20:22:47,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:22:47,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:47,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:47,419 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:47,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-25 20:22:47,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2021-11-25 20:22:47,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:47,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 1521 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-25 20:22:47,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:54,544 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8978 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:54,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:55,269 INFO L134 CoverageAnalysis]: Checked inductivity of 13534 backedges. 8978 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:22:55,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277403908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:22:55,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033969528] [2021-11-25 20:22:55,270 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:22:55,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:22:55,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:22:55,270 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:22:55,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:22:55,383 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:22:56,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '209219#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:22:56,412 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:56,412 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:56,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [138, 138, 138] total 208 [2021-11-25 20:22:56,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358831159] [2021-11-25 20:22:56,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:56,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2021-11-25 20:22:56,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:56,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2021-11-25 20:22:56,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9827, Invalid=37045, Unknown=0, NotChecked=0, Total=46872 [2021-11-25 20:22:56,417 INFO L87 Difference]: Start difference. First operand 413 states and 415 transitions. Second operand has 208 states, 208 states have (on average 3.3076923076923075) internal successors, (688), 208 states have internal predecessors, (688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:00,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:00,998 INFO L93 Difference]: Finished difference Result 894 states and 965 transitions. [2021-11-25 20:23:00,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2021-11-25 20:23:00,998 INFO L78 Accepts]: Start accepts. Automaton has has 208 states, 208 states have (on average 3.3076923076923075) internal successors, (688), 208 states have internal predecessors, (688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 412 [2021-11-25 20:23:00,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:01,000 INFO L225 Difference]: With dead ends: 894 [2021-11-25 20:23:01,000 INFO L226 Difference]: Without dead ends: 619 [2021-11-25 20:23:01,004 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1440 GetRequests, 1157 SyntacticMatches, 0 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19080 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=19213, Invalid=61727, Unknown=0, NotChecked=0, Total=80940 [2021-11-25 20:23:01,004 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 859 mSDsluCounter, 1405 mSDsCounter, 0 mSdLazyCounter, 1630 mSolverCounterSat, 882 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 859 SdHoareTripleChecker+Valid, 1543 SdHoareTripleChecker+Invalid, 2512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 882 IncrementalHoareTripleChecker+Valid, 1630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:01,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [859 Valid, 1543 Invalid, 2512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [882 Valid, 1630 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:23:01,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2021-11-25 20:23:01,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 415. [2021-11-25 20:23:01,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 1.0072463768115942) internal successors, (417), 414 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:01,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 417 transitions. [2021-11-25 20:23:01,050 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 417 transitions. Word has length 412 [2021-11-25 20:23:01,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:01,050 INFO L470 AbstractCegarLoop]: Abstraction has 415 states and 417 transitions. [2021-11-25 20:23:01,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 208 states, 208 states have (on average 3.3076923076923075) internal successors, (688), 208 states have internal predecessors, (688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:01,051 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 417 transitions. [2021-11-25 20:23:01,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2021-11-25 20:23:01,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:01,053 INFO L514 BasicCegarLoop]: trace histogram [69, 68, 68, 67, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:01,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-25 20:23:01,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:01,253 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:01,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:01,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1021061021, now seen corresponding path program 87 times [2021-11-25 20:23:01,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:01,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104755619] [2021-11-25 20:23:01,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:01,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:01,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:03,201 INFO L134 CoverageAnalysis]: Checked inductivity of 13670 backedges. 4556 proven. 9114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:03,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:03,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104755619] [2021-11-25 20:23:03,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104755619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:03,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691995918] [2021-11-25 20:23:03,202 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:23:03,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:03,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:03,203 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:03,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-25 20:23:03,395 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:23:03,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:03,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 139 conjunts are in the unsatisfiable core [2021-11-25 20:23:03,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:04,064 INFO L134 CoverageAnalysis]: Checked inductivity of 13670 backedges. 4692 proven. 8978 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:04,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:04,751 INFO L134 CoverageAnalysis]: Checked inductivity of 13670 backedges. 4692 proven. 8978 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:04,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691995918] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:04,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898966427] [2021-11-25 20:23:04,752 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:23:04,752 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:04,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:04,752 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:04,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:04,857 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:05,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '213840#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:05,365 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:05,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:05,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 74 [2021-11-25 20:23:05,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942516597] [2021-11-25 20:23:05,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:05,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-25 20:23:05,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:05,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-25 20:23:05,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2608, Invalid=4364, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 20:23:05,367 INFO L87 Difference]: Start difference. First operand 415 states and 417 transitions. Second operand has 75 states, 75 states have (on average 5.8) internal successors, (435), 74 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:07,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:07,107 INFO L93 Difference]: Finished difference Result 432 states and 435 transitions. [2021-11-25 20:23:07,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-25 20:23:07,108 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 5.8) internal successors, (435), 74 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 414 [2021-11-25 20:23:07,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:07,109 INFO L225 Difference]: With dead ends: 432 [2021-11-25 20:23:07,109 INFO L226 Difference]: Without dead ends: 430 [2021-11-25 20:23:07,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1449 GetRequests, 1295 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6456 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=7867, Invalid=16003, Unknown=0, NotChecked=0, Total=23870 [2021-11-25 20:23:07,111 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 428 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 282 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 282 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:07,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [428 Valid, 607 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [282 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:23:07,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-25 20:23:07,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 423. [2021-11-25 20:23:07,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 1.0071090047393365) internal successors, (425), 422 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:07,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 425 transitions. [2021-11-25 20:23:07,162 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 425 transitions. Word has length 414 [2021-11-25 20:23:07,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:07,163 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 425 transitions. [2021-11-25 20:23:07,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 5.8) internal successors, (435), 74 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:07,163 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 425 transitions. [2021-11-25 20:23:07,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 423 [2021-11-25 20:23:07,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:07,164 INFO L514 BasicCegarLoop]: trace histogram [70, 69, 69, 69, 69, 68, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:07,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:07,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-11-25 20:23:07,365 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:07,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:07,365 INFO L85 PathProgramCache]: Analyzing trace with hash -1517712253, now seen corresponding path program 88 times [2021-11-25 20:23:07,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:07,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750026767] [2021-11-25 20:23:07,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:07,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:07,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:12,481 INFO L134 CoverageAnalysis]: Checked inductivity of 14214 backedges. 9318 proven. 4896 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:12,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:12,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750026767] [2021-11-25 20:23:12,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750026767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:12,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39003842] [2021-11-25 20:23:12,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:23:12,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:12,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:12,483 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:12,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-25 20:23:12,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:12,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 1555 conjuncts, 140 conjunts are in the unsatisfiable core [2021-11-25 20:23:12,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:19,626 INFO L134 CoverageAnalysis]: Checked inductivity of 14214 backedges. 9520 proven. 4692 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:23:19,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:20,363 INFO L134 CoverageAnalysis]: Checked inductivity of 14214 backedges. 9520 proven. 4692 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:23:20,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39003842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:20,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944691569] [2021-11-25 20:23:20,364 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:23:20,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:20,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:20,364 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:20,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:20,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:21,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '218005#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:21,522 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:21,522 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:21,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [141, 140, 140] total 212 [2021-11-25 20:23:21,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105942051] [2021-11-25 20:23:21,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:21,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 212 states [2021-11-25 20:23:21,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:21,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 212 interpolants. [2021-11-25 20:23:21,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10180, Invalid=38440, Unknown=0, NotChecked=0, Total=48620 [2021-11-25 20:23:21,527 INFO L87 Difference]: Start difference. First operand 423 states and 425 transitions. Second operand has 212 states, 212 states have (on average 3.330188679245283) internal successors, (706), 212 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:26,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:26,234 INFO L93 Difference]: Finished difference Result 913 states and 985 transitions. [2021-11-25 20:23:26,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-11-25 20:23:26,234 INFO L78 Accepts]: Start accepts. Automaton has has 212 states, 212 states have (on average 3.330188679245283) internal successors, (706), 212 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 422 [2021-11-25 20:23:26,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:26,236 INFO L225 Difference]: With dead ends: 913 [2021-11-25 20:23:26,236 INFO L226 Difference]: Without dead ends: 632 [2021-11-25 20:23:26,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1474 GetRequests, 1186 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19818 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=19842, Invalid=63968, Unknown=0, NotChecked=0, Total=83810 [2021-11-25 20:23:26,241 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 636 mSDsluCounter, 1582 mSDsCounter, 0 mSdLazyCounter, 1784 mSolverCounterSat, 497 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 636 SdHoareTripleChecker+Valid, 1722 SdHoareTripleChecker+Invalid, 2281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 497 IncrementalHoareTripleChecker+Valid, 1784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:26,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [636 Valid, 1722 Invalid, 2281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [497 Valid, 1784 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:23:26,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-11-25 20:23:26,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 425. [2021-11-25 20:23:26,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 1.0070754716981132) internal successors, (427), 424 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:26,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 427 transitions. [2021-11-25 20:23:26,289 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 427 transitions. Word has length 422 [2021-11-25 20:23:26,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:26,290 INFO L470 AbstractCegarLoop]: Abstraction has 425 states and 427 transitions. [2021-11-25 20:23:26,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 212 states, 212 states have (on average 3.330188679245283) internal successors, (706), 212 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:26,290 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 427 transitions. [2021-11-25 20:23:26,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 425 [2021-11-25 20:23:26,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:26,291 INFO L514 BasicCegarLoop]: trace histogram [70, 70, 69, 69, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:26,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:26,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:26,492 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:26,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:26,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1855217192, now seen corresponding path program 89 times [2021-11-25 20:23:26,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:26,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502129611] [2021-11-25 20:23:26,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:26,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:26,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:31,733 INFO L134 CoverageAnalysis]: Checked inductivity of 14352 backedges. 9318 proven. 5034 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:31,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:31,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502129611] [2021-11-25 20:23:31,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502129611] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:31,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481912281] [2021-11-25 20:23:31,733 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:23:31,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:31,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:31,734 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:31,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-25 20:23:32,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 70 check-sat command(s) [2021-11-25 20:23:32,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:32,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1565 conjuncts, 142 conjunts are in the unsatisfiable core [2021-11-25 20:23:32,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:37,669 INFO L134 CoverageAnalysis]: Checked inductivity of 14352 backedges. 4830 proven. 9522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:37,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:38,395 INFO L134 CoverageAnalysis]: Checked inductivity of 14352 backedges. 4830 proven. 9522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:38,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481912281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:38,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [232561037] [2021-11-25 20:23:38,397 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:23:38,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:23:38,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:23:38,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:23:38,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:23:38,532 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:23:39,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '222869#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:23:39,613 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:23:39,613 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:23:39,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [142, 72, 72] total 213 [2021-11-25 20:23:39,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796339128] [2021-11-25 20:23:39,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:39,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-25 20:23:39,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:23:39,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-25 20:23:39,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7772, Invalid=41290, Unknown=0, NotChecked=0, Total=49062 [2021-11-25 20:23:39,620 INFO L87 Difference]: Start difference. First operand 425 states and 427 transitions. Second operand has 213 states, 213 states have (on average 3.976525821596244) internal successors, (847), 213 states have internal predecessors, (847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:52,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:52,962 INFO L93 Difference]: Finished difference Result 927 states and 1001 transitions. [2021-11-25 20:23:52,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 285 states. [2021-11-25 20:23:52,962 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 3.976525821596244) internal successors, (847), 213 states have internal predecessors, (847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 424 [2021-11-25 20:23:52,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:52,965 INFO L225 Difference]: With dead ends: 927 [2021-11-25 20:23:52,965 INFO L226 Difference]: Without dead ends: 644 [2021-11-25 20:23:52,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1762 GetRequests, 1261 SyntacticMatches, 1 SemanticMatches, 500 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88075 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=38295, Invalid=213207, Unknown=0, NotChecked=0, Total=251502 [2021-11-25 20:23:52,980 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 1512 mSDsluCounter, 1081 mSDsCounter, 0 mSdLazyCounter, 4671 mSolverCounterSat, 1638 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1512 SdHoareTripleChecker+Valid, 1153 SdHoareTripleChecker+Invalid, 6309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1638 IncrementalHoareTripleChecker+Valid, 4671 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:52,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1512 Valid, 1153 Invalid, 6309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1638 Valid, 4671 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 20:23:52,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-25 20:23:53,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 431. [2021-11-25 20:23:53,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 430 states have (on average 1.0069767441860464) internal successors, (433), 430 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:53,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 433 transitions. [2021-11-25 20:23:53,038 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 433 transitions. Word has length 424 [2021-11-25 20:23:53,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:53,039 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 433 transitions. [2021-11-25 20:23:53,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 3.976525821596244) internal successors, (847), 213 states have internal predecessors, (847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:23:53,039 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 433 transitions. [2021-11-25 20:23:53,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 431 [2021-11-25 20:23:53,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:53,041 INFO L514 BasicCegarLoop]: trace histogram [71, 71, 70, 70, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:53,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:53,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:53,241 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:23:53,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:53,242 INFO L85 PathProgramCache]: Analyzing trace with hash -1531937344, now seen corresponding path program 90 times [2021-11-25 20:23:53,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:23:53,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988809674] [2021-11-25 20:23:53,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:53,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:23:53,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:58,717 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 9593 proven. 5177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:23:58,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:23:58,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988809674] [2021-11-25 20:23:58,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988809674] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:23:58,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668718246] [2021-11-25 20:23:58,717 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:23:58,717 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:58,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:58,718 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:58,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-25 20:23:58,918 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:23:58,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:58,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 144 conjunts are in the unsatisfiable core [2021-11-25 20:23:58,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:04,535 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 4970 proven. 9800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:04,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:05,324 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 4970 proven. 9800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:05,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668718246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:24:05,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536185101] [2021-11-25 20:24:05,325 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:24:05,325 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:24:05,325 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:24:05,325 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:24:05,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:24:05,431 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:24:06,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '228294#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~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)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2021-11-25 20:24:06,501 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:24:06,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:24:06,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [144, 73, 73] total 216 [2021-11-25 20:24:06,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493001884] [2021-11-25 20:24:06,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:24:06,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 216 states [2021-11-25 20:24:06,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:24:06,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 216 interpolants. [2021-11-25 20:24:06,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7989, Invalid=42411, Unknown=0, NotChecked=0, Total=50400 [2021-11-25 20:24:06,507 INFO L87 Difference]: Start difference. First operand 431 states and 433 transitions. Second operand has 216 states, 216 states have (on average 3.9768518518518516) internal successors, (859), 216 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:24:19,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:19,302 INFO L93 Difference]: Finished difference Result 940 states and 1015 transitions. [2021-11-25 20:24:19,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 289 states. [2021-11-25 20:24:19,303 INFO L78 Accepts]: Start accepts. Automaton has has 216 states, 216 states have (on average 3.9768518518518516) internal successors, (859), 216 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 430 [2021-11-25 20:24:19,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:19,305 INFO L225 Difference]: With dead ends: 940 [2021-11-25 20:24:19,305 INFO L226 Difference]: Without dead ends: 653 [2021-11-25 20:24:19,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1787 GetRequests, 1279 SyntacticMatches, 1 SemanticMatches, 507 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90576 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=39374, Invalid=219198, Unknown=0, NotChecked=0, Total=258572 [2021-11-25 20:24:19,320 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 1500 mSDsluCounter, 943 mSDsCounter, 0 mSdLazyCounter, 4679 mSolverCounterSat, 1718 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1500 SdHoareTripleChecker+Valid, 1016 SdHoareTripleChecker+Invalid, 6397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1718 IncrementalHoareTripleChecker+Valid, 4679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:19,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1500 Valid, 1016 Invalid, 6397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1718 Valid, 4679 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-25 20:24:19,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-11-25 20:24:19,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 437. [2021-11-25 20:24:19,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 436 states have (on average 1.0068807339449541) internal successors, (439), 436 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:24:19,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 439 transitions. [2021-11-25 20:24:19,434 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 439 transitions. Word has length 430 [2021-11-25 20:24:19,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:19,434 INFO L470 AbstractCegarLoop]: Abstraction has 437 states and 439 transitions. [2021-11-25 20:24:19,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 216 states, 216 states have (on average 3.9768518518518516) internal successors, (859), 216 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:24:19,434 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 439 transitions. [2021-11-25 20:24:19,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2021-11-25 20:24:19,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:19,436 INFO L514 BasicCegarLoop]: trace histogram [72, 72, 71, 71, 71, 71, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:24:19,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:19,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:19,637 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:24:19,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:19,637 INFO L85 PathProgramCache]: Analyzing trace with hash -25079400, now seen corresponding path program 91 times [2021-11-25 20:24:19,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:24:19,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774447351] [2021-11-25 20:24:19,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:24:19,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:24:19,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:25,112 INFO L134 CoverageAnalysis]: Checked inductivity of 15194 backedges. 9872 proven. 5322 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:24:25,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:24:25,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774447351] [2021-11-25 20:24:25,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774447351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:25,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133385529] [2021-11-25 20:24:25,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:24:25,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:25,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:25,128 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:25,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8b1c35c-9ffd-497a-80b3-cb38da80563d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-25 20:24:25,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:24:25,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 146 conjunts are in the unsatisfiable core [2021-11-25 20:24:25,352 INFO L286 TraceCheckSpWp]: Computing forward predicates...